If you have not owned it for 12 months it can be supplemented with a Airdna report or the appraiser giving a short term rental estimate on the 1007 report using short term comps in the area. 

In many parts of the country AC is not needed in a basement and you could use supplemental heat sources

Just need something to supplement my retirement

I helped 37 clients buy or sell multi-family last year and in my experience from these and many other is that those people who want to build wealth and supplemental income through rental properties usually struggle the most with saving the next down payment, which is the true value of these live in loan options at 3.5% (FHA) and 5% (conventional)..  

They are going to be supplements to other steams of income in my retirement.  

I own a primary residence on Maui and am interested in building an ADU to supplement income after losing my vacation rental condo in Lahaina.

And typically it's in conjunction with other activity such as grazing cattle, growing crops, timber, etc.I can't see it being a good way to make money, just a supplement to farm/ranch income.

I have my Masters degree in Project Management and my retirement plan is to have enough rental properties to supplement my W-2. 

Tenants should be paying market rent otherwise their landlord is supplementing their rents.

Capital gain and rental income are not our main investment objective but it would be nice to supplement our living expenses.