Then, act like Warren Buffett and Buy when everybody is Selling and there is blood in the street like in 2008.

So year over year the cash flow stream becomes worth less and less due to inflation kicking in annually.So let's say 15 years into a 25 year lease the income stream will be highly devalued versus other asset types available at the time for purchase. 

Furthermore, Frank said this:"In forty years of dealing with real estate investors and ten years of dealing with grad students who are learning this sort of thing I think I find the one issue they have the hardest time wrapping their head around is the notion that a property, if it’s a true income producing property, its value is based on its income stream, not on comparable sales."

For example if you are in business and want to employ 20 people you can do that, the trick is to build your business so the income stream and work demand justify hiring 20 people. 

It kind of boils down to have passive you want your passive income stream to be.  

It also gives you a some security in the sense that if you are ever laid off or your income stream is reduced for some reason, you can always just stop the extra optional payments.So let's say your 30yr fixed is $1k/month.

I feel it's comparable to me deciding to become a doctor and asking questions about How do I draw blood?  

Establishing a separate LLC for the sales commissions / real estate agency stream of income likely wouldn't be worth it unless she's receiving commissions from representing outside investors in addition to your properties.

With a little blood, sweat and tears you have no vacancy.

Hi @Sam Guba and my hat's off to you for your ambition to have a career that works for you...I think having multiple income streams (esp one from real estate) is the way to go for many people.