I believe the key here is going to be intent, so finding a way to demonstrate clearly that your intent with the property has changed from occupancy to investment would be important. 

Your preapproval not pre qual should say they can close in 20 days and demonstrate how this will happen

Check out the housing stats:Florida Realtors research demonstrates a year-over-year Closed Sales up 57%, Cash Sales up 119%, Average Sales Price up 33%, Dollar Volume up 110% ($2.7 billion), and Months Supply of Inventory down 59% in Miami-Dade County.Fortune Builders recently listed Miami as a top ten city for rental prices (Check out Fortune Builders Cities with Highest Rents data), and Insurify places Miami at #3 for percentage of renters (Where are the Renters?).

Did the seller want any documentation to demonstrate that a loan was not going to be available?

The answers to those questions above is what is going to demonstrate how many times you're likely to be dealing with non pay.

Include 20 or so photos clearly demonstrating it wasn't done.  

That would demonstrate the agent looking out for your interests and you proceeded anyway. 

I do have some capital to invest as a minority partner to demonstrate my commitment to making things work.

Operational costs are a direct hit on profitability.The Impact of Operational Costs on ReturnTo demonstrate the impact property taxes and insurance can have on return, I put together the following example.

Isn't that also demonstrated by carriers asking if you've had ANY claims in the past 5-7 years?