Be sure to check out the free tools BP provides to help analyze deals you may have and also market insights.

It sounds like you have an un-permitted unit, which is essentially always a risk since there has been no notice to the AHJ that it exists and they can therefore initiate a code case to have it removed in most cases.

Be sure to check out the free tools BP provides to help analyze deals you may have and also market insights.

Just curious - what tool are you using to create these graphs and tables?

If you control how they perform tasks, set their hours, or provide tools, they should likely be a W-2 employee, requiring you to withhold taxes and comply with payroll regulations.

The precise property forecast can vary depending on a lot of factors but the general demand is really what you should use the tool for to make your plans. 

Tools like Rentometer and Roofstock can help with market analysis and property selection.Good luck!

all materials, all labor costs to others, Not you, utilities, interest payments, permits, licenses, auto/truck expenses, tools needed are all deductable. 

Has anyone used the DIY tool, and are there risks?

Quote from @Joy Daniels: As a short-term property manager I've seen how this industry changes so often—new guest trends, tech tools, and regulations seem to pop up all the time.