While I know that return goals are different for each investor and their specific goals, it seems that a bad or low-performing deal for one person might be what another investor is looking for. 

Sold it early because of my relationship and had to move.

Just my personal experience.

I'm looking to identify a builder with the following characteristics:1) Eager to grow his/her company and reputation in the market2) Has produced at least five high quality builds in Arizona which are at least 4K sq ft  3) Has proven track record of completing builds in a timely manner4) Personal capital to allocate to projects (optional, but ideal)Please reach out to me if you or someone you know might fit these criteria. are you set that you want luxury?

Assuming I also use the Airstream for lodging while traveling for personal reasons, would I just take a pro-rated amount of depreciation for the amount of use that is business vs. personal?

Little did I know it would take decades to ripen :)3. bought a foreclosure sale .. traded the house for the 3 acres the person who owned the house. 

I imagine there is not much of a relationship with the turnkey service after the sale and I would deal with the PM and Loan company directly. 

In person control before controlling re from the distance.

I have a 2-person unit with a glass top dining table and it has worked well.

That would be a separate mortgage and not what amounts to a second loan on your personal residence, which if you have spouses, they might not be that into.