The property sat on the market for a month before an offer came in, but the buyer backed out at closing.

up to 20% DSCR through lenders I deal with

congrats on the first duplex. easiest will be house hack your next property. you can go higher in units up to 4 but just need to occupy the property. lets connect if you need guidance, i house hacked a few times

the cash flow you are referring to, are you attributing that to the $900 difference between the PITI and the gross rents?

The “hot tub show” models will work, but you will do more work on them in the end.  

Even a single family builds can vary significantly based on site conditions and required structure/design.

It's good to see it through each season then you;ll have a better idea of what to expect. 

It is currently rented, and we are bullish on the building and plan to keep the unit in our portfolio.

Hi Giovanni, welcome to the community!

Focus on the actual deal first.