Also make sure the installation is done correctly.

The house that i am looking into buying is in centerpoint alabama and purchase price at $100k.The major concern that i am having are:The roof is at end of life.floor joist needs to be install due to flooring bad deflectionThere are broken cement at the patio / deckPossible water leak to the basement walls.i just don’t want to be the person who ends up with the expenses the previous owner should be taking care of.Can you give an advice on how to deal with this property?

On table 19 (page 38) I see that one of their biggest expense was "Premium and fees on redemption of MTN".

Your lack of firmness over time may have lulled this tenant into putting less priority on paying his housing bills.Some tenants are chronically late and pay the rent by mid month, plus the late fees.

It doesn't take a lot for a project to go 150-200K over budget when the building department holds you up, the gas company can't install new lines for 6 months, and your subs walk off the job. 

Any recommendations for banks with low fees/complicated setups (setting up a Wells business bank account was basically hell) etc?

The attorney's fee would be worth it.

I believe he had a sub 10% fee at the time as well.  

Don't sink money into an attorney unless you see specific value they can provide.I think all in if you're $250 in fees/costs to pursue, with possibility even of only say 20% of repayment, at the $10,000 - I'd take those odds every time.

I have been told that this can very difficult and costly to do due to opening walls/ceilings.(2) Install a mini split system (outside condenser and wall units) for the second and third floor.