Let them know they will not be able to buy a home, get a mortgage, rent in another community, and could jeopardize their current credit card limits.If you are at your wits end and you know they do not care about credit and are ducking you then report the lates. 

I am no longer a resident of Miami, but I am aware of the potential obstacles you bring up. 

But -- rant incoming -- as @Erin Spradlin, resident midterm rental expert in our household would probably ask you, why limit your targeting to just one demographic? 

Or Your current resident home insurance?  

Step one is to buy a primary residence to live in, step two is to buy another primary residence to live in and turn the 1st one into a rental.

Purchase price: $165,000 Purchased as primary residence turned rental property.

Be careful cutting in around the ceiling and use drop cloths.

Investment Info:Single-family residence buy & hold investment.

I think the lack of cash flow and delayed return would be aided by the fact that they would get their investment out at the first refinance, and the fact that I would take care of returning their investment before paying myself.  

Purchase price: $950,000 Cash invested: $150,000 Single-family residence with potential to add two separate ADU apartments.