All tenants are reportedly current on rents The current owner appears to have bought it at $179k in fall 2018 and reportedly put $100k into it ( a new roof, new insulation, new dual pane, energy efficient windows, fresh interior and exterior paint, shaker cabinets and counters, new tile and carpet flooring throughout, and electrical/plumbing improvements. ) At the asking price, with 20% down, assuming $3k in repairs it would give about $1100 in cashflow (above all expenses) which would be 16.5 % cash on cash return. 

I know if you sell a car, get paid, but fail to deliver it is considered theft.

Lots of questions packed into this, but I believe in the BP community's wisdom to deliver!

Anticipated FeesMost custodians, you'll pay a $50 transaction fee, plus a charge depending on how you want the funds delivered to the borrower ($7 for a check, $30 for a wire, no fee for an ACH). 

We fully remodeling the house new kitchen, bathroom, added in unit laundry, refinished hardwoods and fresh coat of paint.

R22 is about $12 a pound on Ebay, delivered. 

You buy based on that market's ability to deliver the largest spread between cost to get in, and cost to get out. 

Some other things I thought about was asking price, rents, rentability, ability to raise rents, will it cash flow after I move out and rent out both sides, age of roof and hvac, what kind of cosmetic upgrades would it need right away, are the current tenants paying rent and in good standing or should I ask for the duplex to be delivered empty at close, the leases of the current tenants and how long the leases are. 

We were on the buy-side of a deal and decided to exercise our contractual right to pull out (our notice was delivered during the DD period).

IMHO, solutions like those also require a PHD, so most real estate folks simply don't have the time to uncover the horsepower they can deliver.