@Lawrence Adeniseun I cant answer the financing question but on the remodel there are some things to consider. How old is the duplex? If it is more than 15 years old there will have to be an update in the fire wall. The new fire wall will have to go under the roof deck which means you have to redo some of the roof. I cant really speak for your jurisdiction but that would be a worse case scenario. Being that it is fire damage its likely it wont be grandfathered and they wont let you slide. Check into that first.
OTOH, since it only affected one side it may already have it done. If you can see sheetrock under the roof deck near the firewall its all good as long as its not damaged. Best of luck.
Based on the numbers you mentioned, I don't see this property cashflowing for you in the end. To me, it seems like to much unknown risk for to little upside.
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