I can quickly create bank accounts for each property, the categories for tagging your transactions align perfectly with your Schedule E for taxes and I can do all of my tenant related functions like tenant vetting, lease creation and collecting deposits and rents.

I know cost is a factor but think about overall functionality and does it do the 7-10 things you really need? 

While many will also create LLCs or other entities and perform other services, that is not their core function.

Supply and demand is very high right now because people are moving from outside the FL to here because of the what type of restrictions the COVID virus has caused in other states.

It’s a variable rate but the nice thing about using a Heloc is you can use it multiple times as it functions like revolving credit, ie similar to a credit card.

If you property is functionally obsolete like only has 1 bathroom, adding a bathroom would likely pencil out.  

I build it like any other home there's nothing special except for some of the extras we add in for functionality. we sell our inventory though. 

What you need is the source-data, a programmer to build you an app based on this data, and a experienced developer to instruct the programmer on how the algorithms/functions should perform these actions so they are actually useful.

I'm anti fragile.

The owner really wanted to sell to a business that could use the function room within the building.