His rehab costs were less than what I Typically pay to paint the interior of one of my rehabs.  

She normally pays rent on time except for the last couple of months when she paid a few days late with late fees.  

But they're the only ones staying and paying rent!

I am focusing on residential properties for fix n flip and BRRR.

This deal was intriguing because it was rent ready as-is, but I knew that when we could afford it, the rehab would really pay off.

As long as it is in your house rules and you have evidence of them staying later, Airbnb will pay you out.

I used to pay a site visit to every property of which we were considering lending or purchasing an existing note.

I only know about the times where this was found out prior to closing, obviously I have no way to know about the times this shady behavior wasn't found out.Since you get a vote in who this tenant is, and it's retail, PSA that commercial lenders (especially the ones offering the best terms...) are starting to vet deals by how 'recession proof' the tenants are, even if they are currently paying on time.

Would the goal after I get a duplex to use the income streams and my work income to pay it off as soon as possible?

The LLC business account pays the bills.