It is extremely expensive.

My husband has become extremely stressed and disheartened by the situation, to the point where he no longer wants to work with this partner or on the property.The property is divided into two units: the main unit is nearly complete, but the mother-in-law unit is still under construction.

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

However, finding the right fit for you and vetting that person is going to be extremely important. 

A high end luxury home like this may be possible as a midterm rental but it's definitely extremely niche.

Yeah absolutely, I'm always extremely friendly with, well everyone generally, but every appraiser.

Unfortunately, there are a few bad eggs who take extreme advantage of people which inevitably causes these issues.

Funny thing is your opinion in those posts is extremely aligned with mine, it's more the approach where I cringe and go...

And of course, these are two extremes along a spectrum. 

Expenses are extremely cheap for it as well compared to my other units.