Everything in the unit (floor to ceiling) was wiped down with vinegar/water and then I shocked the entire unit using an Ozone Generator. 

A flooded basement with just 1 inch of water is enough to cause a lot of destruction.

Ice water is on the house.I'm a regular attendant at Johnson's meetup for a good reason.

Install new water heater.

So I am looking at a duplex that got water/mold damage on one side, and minor water damage (Door left open or something like that) on the other side.

They are all vacant, except for that one with a squatter dude, and I don't know which unit he's in but he had cable and lights and water.

You will need engineers to do drainage studies.It will cost you at least $25,000 for the subdivisionYou will have additional costs during development because you will likely lose your water tap and your wastewater connection on at least one of the lots (I'm assuming that the existing connections will no longer fall within the guidelines of the land development code)..The city will tell you that this takes 6 months.

Please advice.Price $250,0002 FamilyRents: $1,200 per unit2 – 2 beds unitsBrickAge of roof unknownTaxes: 5,300Age of the property: 72Garage and DrivewayNothing to do but to move in (unless you want to update the kitchen)Very well taken care ofUsed to be oil tank but now removed and converted to Gas1 meter for both units – water and gas (the seller splits the bill between two tenants)1 unit if rented at $1,2001 unit is vacantThe roof is still good but in the next 5 years might need some work.Thank you

It's on a river, on a snowmobile trail, close to skiing, and whitewater & flat water kayaking.Also had a chat with an acquaintance/friend that is interested in being a private lender for our long term rentals.   

RMs are usually dead in the water right there.  95% payoff amount plus court costs to probate an upside down property.