We are still working on deciding the best exit strategy at this time but are leaning towards STR or Group Home for increased returns.

If your giving up money just to 'control an asset' -- I'd think long and hard about that. 

Most new finishes will last for a little bit, but given many tenants are hard on things, it won't last long.

This fee was not part of our conversation/discussion or the estimates that was provided to me while we are going through the closing process.

We have a single-family long-term rental in Port Charlotte that we'd like to keep the current mortgage rate, but we do have some equity we'd like to have access to. 

Furthermore, we have a less than 3% interest rate on our home, and we love were we live.My family and I are finally getting to a position in life where we are financially secure.

I've included a preliminary floorplan below.My goal with this ADU is flexibility in terms of renting it out either short-, medium- or long-term rental in the future for income, as well as maximizing resale value (main property is 1300 sq ft 3/2) to someone probably with an investor mindset who would want to house hack.My main concern is whether it's a good idea to have 3 en-suites at the expense of having a small living room/kitchen area.

We are based here in Chicago and have GC business, for reference.  

It's truly the best option for your scenario for the best long term outcome, and the other options aren't close.Best of luck!

I fund A and D  I dont work in the trench's and try to do these for my own portfolio as I have ZerO interest in owning a ton of rentals.. we are just interested in income..