It's a technically a temporary structure so I can't make it a separate unit, and the area would be separated by a fence for privacy.

@Nathan Sawyer For a 1-4 unit, always consider tenants temporary.

It changed my mindset and removed the emotion of being a home owner.

Don't emotionally attach yourself to a property.

Don't burn a long term neighbor relationship over what is likely a temporary tenant.On the other hand, if your neighbor is a screwball, it makes things a lot tougher but active diplomacy should still be the first line of defense here.

All of a sudden, my attorney and realtor notify me that the previous temporary Certificate of occupancy expired since January and I have to apply for a new one.

We bought several properties, but it was a major emotional discussion every single time. 

You know your own situation best, but that certainly sounds like asking for trouble--emotional, financial, logistical. 

Offer some temporary discount pricing so you can get some 5 Star reviews.

Since you're moving so far away, you might want to look for a temporary place.