For re-sale and ease of financing (for developer and next buyer) two larger duplexes would be my suggestions.

After taxes and selling costs we should net roughly $700-850k depending on final sale amount. 

Once you close the problem with those tenants whom you don't have a relationship / history with will be yours. 

I'm closing mid October so will be in the area to set it up late October if you want to meet up. :-)

IB will always be close to Mexico, that is not changing.  

I finally received a demand letter from a "nonprofit attorney" representing the tenant, claiming that the tenant was living in uninhabitable conditions—typical for a non-paying tenant, I guess—and now she wants to "renegotiate" the rent and keep living in the same space.She has been filing complaints with various government departments, but all the cases were minor and have been closed.

Has anyone experienced a decrease in valuation or sales prices due to a property having annual HOA fees?

Other useful features include information on prior sales and existing mortgages on properties.  

We support all of our community members and we are closely monitoring the developments, news, and travel advisories to Florida.

I can also infer a few other items in later points, such as vacation destination, no sales tax, and a commuter state. b.