They're offering 3.99% interest rates (covering 6% of the home cost to buy down the rate), $10k in bonus money, plus a fridge, washer, and dryer.Because they can't stop building, they have to offer extremely good incentives to keep the product moving in this buyer's market.

I haven't made claim from shelter but my agent from shelter is extremely helpful.

Posters will chime in on recommended strategy but real estate is extremely localized and the fundamentals of the real estate in any given market are what should be dictating your investment strategy not arbitrarily deciding to buy single family homes vs. duplexes. 

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.

For a long term real estate investor, or one who hopes to be in it long term, a great lender relationship may be VITAL to your survival during hard times and your ability to take advantage of wealth building opportunities during good times.