An AC can fail, foundation can crack, driveway needs repaired, etc.The "pros"...Comps are usually pretty easy to get because there are several identical units (sqft and layout) to compare to.  

My lease states that electricity, water, internet, cable, phone, etc are NOT included in the rent and must be paid for directly by the tenant to the service provider.

BP is maybe the greatest free resource to help you get started in Real Estate Investment there is on the internet.

@Johnny Dang I own a few very similar buildings in age, size, layout and rents and have sold 3 of them as an agent also.

That's why I really like when lenders lay out the rates and let the borrower choose the one they want. 

It needs to lay out expectations upfront.

I've been looking around the internet, but does anyone have a favorite service/ checklist for screening?

I search over and over on internet and in books, but there is no definite answer.Any clarifications are appreciated.

He said he wanted 70k I told him I could give him 50k ( I paid 89.9 in December of '18 for mine and they're basically identical layout, mine appraised for 107k when I bought it) I am part of the local REIA and reached out for some help. 

@Huso Akaratovic, try Bank of Internet.