@Kar Sun  I wouldn't rent to them based on the child behavior and the lack of attempt to contain that behavior. 

There's really more to it than that, but it would take 10-15 minutes worth of talking to fully explain, which is a little too much for a forum post.The sale or exchange of the dwelling unit requirement that you're reading in both the majority and the dissent of Gates is in effect an anti-abuse rule to prevent someone from engaging in behavior such as: buying land, putting a mobile home on it, then moving the mobile home to a new lot and selling the old lot every couple of years while utilizing the Sec 121 exclusion on each lot sold. 

Typically, not nefarious, it’s still a behavior that operators must prevent to reduce liability or misuse.Kastle’s AI video surveillance immediately alerts our live monitors to confront violators if such infractions occur.

"For sale, a 10 page contract with excellent font on 10 pound paper, $5000 or best offer"And that is not even getting into the really despicable behavior like not having an ability to close but signing the contract anyway or purposely taking advantage of confused/uneducated sellers.  

If the behavior continues, you can send a second notice and request from the tenant that this "guest" vacate the apartment as the current tenant is in breach of their lease. 

Three things:1) After we moved when I was a child, my parents rented out our old house so I had seen RE work before.2) I am a mathematician and I'm compulsive about running the numbers, so I knew it was a good deal.3) I always knew that I wanted to get rich.

But ultimately it probably comes down to behavior. 

Having had 1,000's of tenants over the years I can unequivocally say that this behavior is par for the course.

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The International Monetary Fund (IMF) has published the results of research conducted into how lenders are likely to be doing their business in the future, and what new information and personal data these companies plan to start asking from borrowers in order to determine their credit score.The biggest takeaway is the seemingly inevitable shift from merely accessing credit information to also incorporating people’s online behavior into the process of deciding whether to lend them money necessary, for example, to buy a house.Compared to the way the system now works in most countries – these changes, which are expected to be coming soon, look fairly invasive privacy-wise, and with no “vision” of proper safeguards.