on the other hand Door knob change out takes approx 1.5 hours (figuring 8 door knobs) and around $150 for the knobs I do that as there is not much in the way of unexpected things you run into. 

The gentleman passed away unexpectedly leaving his girlfriend to sell everything.

There are just too many variables and unexpected changes.

@Daniel HanWhen asked about what could go wrong, I mention rents not being paid, poor underlying financials at the outset, unexpected expenses, to name a few. 

I have a name of his daughter, (small town, old family) and possible contact info but not sure how to phrase this whole situation to someone dealing with a recent unexpected passing. 2b.

A casualty loss is defined as the damage, destruction, or loss of property resulting from a sudden, unexpected, or unusual identifiable event (e.g., car accidents, storms, floods).

Some sellers are reasonable and can support you in this unexpected situation.

@Noah McPherson a longer period buys you time in case you have unexpected problems, but make sure there is no penalty for early payment.

It can be risky to mix friendship and business and if it would be a shame to burn bridges if something unexpected happens and feelings are hurt.

Day of purchase (after the walkthrough), tenants left unexpectedly and trashed the unit.