Your questions are overly broad which indicates you haven’t looked into it much

The numbers on the deal works and indicates that I’ll make a killing on it.

I think our industry needs a set of KPI's (Key Performance Indicators) of its own; asking ourselves "what are the most important items we need to track so we are as successful as we can be" and use these numbers as a benchmark for performance, comparing them with like minded owner/operators.   

Drywall cracks, space between trim and floor(both possible foundation issue indicators), proper attic venting(check temp in attic)

The fact they are complaining online might be an indication the property manager dealt with them properly so be sure to ask the manager for their side of the story.I hope this basic guide helps.

I have read a lot of posts and watched a lot of BP YouTube videos that indicate a lot of people are able to get private funding by asking the owner to finance.

Pay attention to the level of rehab on these properties a comp that sold that was a total dump is not going to be a good indicator.

I would suggest in future post you indicate what type property it is and what type information you would like us to review/provide. 

You would know this if they have had a reserve study done and that study would indicate the amount they should have in reserves. 

Because it supposedly indicates people who can’t pay their taxes so they may need to sell, at an assumed discount, before they lose their property.