Can potentially make more money in less time, and control when someone stays.  

A building built in 1960 might be better maintained and have less issues than one built in 2000.

@Alicia HallThe question is how many rooms will be added with that casino resort and are they going to draw more people than they can house?

I realize you are an expert on 1031 but perhaps "interest tracing" concept is less common...

There are 100's of real estate podcasts out there and honestly I have found many that are better than BP as they have people who have been in real estate and business for a very long time and could run circles around some of the hosts. 

I've noticed in my area that houses that have been converted into 2 units tend to sit on the market for much longer and sell for much less than traditional single family houses with similar sqft and finishes.

The other requirements in the listing such as credit score, rental history, etc would remain unchanged. 

They told me they had little stress at this point, and by the time they were ready to buy the bankers used the income from the rentals, the process was easier, and they got a much better house than they ever thought.A success in reverse order (but why reverse?

There is more leverage / less money down when doing a purchase compared to a refinance.

@Tina LiaoTenant screening includes a credit check, a background check, income verification, references, and interviews to determine financial responsibility.