This may affect value or time required to sell.7) Adding an ADU does not make the property a duplex.

Though certainly they can sell for more than they cost to build. amazing strategy 

And you can do other things, rent, sell on terms, etc etc etc..

It's a small place so I'd guess it won't rent for enough to cover your expenses anyway so I'd probably sell, especially if the loss is small, it unless it's in a great neighborhood that you think will do well over time. 

You sell your investments whenever it no longer makes business sense to hold them, not when you "need" it for tax reasons!

We scraped the old house and we build new home, where the houses are selling close to the $1.8M What was the outcome?

One was purchased a  few years ago by an out-of-state owner who has decided to sell and has doubled in value.

Quote from @Allen Berrebbi: Quote from @Dominic Mazzarella: I have personally owned and managed a multifamily property in Illinois and after selling it I said I would never invest in that state again.

Those sell but builders generally have to give some pretty aggressive rate buy downs to help those qualify move up luxury is still moving without having to give big concessions.

I would definitely sell to an owner occupied resident since that is what the park is telling you.