I have also been told in person by an individual that is a licensed Realtor that it is +- 600 sq ft.Can someone give a thorough explanation on the rules to finding comps?

I personally just attend 1 to 3 auctions in my home state of SC.

. - The 3rd lender, on the right, with the best rate, requires that one borrower/sponsor be experienced in the asset class, and that they personally live local to the property. - 1 regional lender (Pima + 1 other county), 1 state-wide lender (AZ), and 1 national lender, not in that order, is represented here. 

I'd love some feedback online or in person. 

I have enough in savings to pay for it but I keep asking myself should i just sell it and get it off my plate and lose the low interest rate or bite the bullet and do a big rehab and continue renting it out.

Every person that has completed ground up construction in Cape Coral has turned out positive, but there have many been many delays and limited communication from specific builders that we are aware of and offering guidance on a case by case basis. 

For your investment property loans, if they are done in an LLC, most of them don't report to your personal FICO Score, however you can ask the lender before you get a loan to verify. 

I won't make any profit on it, but he's paying the bills and our hope is that he will buy it from me in 1-2 years or we'll keep it as a rental and he'll buy something else.

Personally - we have found a lot of success scaling from single family to multi by a combination of all the above.

Open a personal account, use their banking services & if you can demonstrate a track record of executing on the real estate loans they fund for you, these relationships can really accelerate your growth.