It looks like a very simple or basic apartment, and it needs some serious design pieces.

The reason behind that is simple: maintaining infrastructure for low density single family housing is cost prohibitive. 

Is the process as simple as finding a local builder (one that was recommended has 15-20 yrs exp.)? 

In my experience, keeping things simple and straightforward with sellers works best.

I do have a contractor bidding it tomorrow, I was just hoping someone would have a rough $/LF or something similar to use for a ballpark, but figured it may not be that simple since it of course depends on specifics.

Mail out flyers is the best way.You can drive around the area that you are interested and see if it looks abandoned and find the owner.It's off-market so it means a lot of manual work on finding them. do a simple internet search and you will find many ways.

Regarding your 2nd floor kitchen faucet that is experiencing low water pressure, it's likely a simple fix such as the faucet aerator (a screen that helps create a smooth stream of water).

While it’s relatively simple and can help you find deals, it’s also time-consuming.

I can recommend some good cost seg guys to help you maximize those deductions.Be sure to communicate this information to your accountant as well, so they can help you plan and be aware of the situation.

Did y'all get the VRBO email on their new Host Communication policy and with it, sale of property?