Meaning that 75% of the rents on all 3 or 4 units, even the owners unit, must at least equal the total monthly payment.

if your mortgage payment net of rent is equal to or less than what it would be renting, it's a better choice.say you could A. rent for $2000, or B. have a $3000 mortgage and collect $1200 in rent. 

@Leonardo Morantes Gomez again, you should calculate the tax savings from selling and then determine if/where you can invest that would equal that ROI.Another issue to consider in your calculations is what is your current mortgage rate vs what you would get today.

Most people get reach from real estate from the appreciation not from the cashflow.I do think that time equals lots of money so if you go into a job that gives you more time it will be easier to invest in real estate.

. $300K as I put a hefty amount down through that 1031 exchange).Current offer on the table proposed by my broker:$600K Purchase price7 year lease with option to purchase within 3 years for an amount equal to $600K less what they would have otherwise paid in principal under under a 7% loan for the same period). 

The could be a equal preditor or worse.

Too many people think you need to have equal partnerships for things to work, but that's not the case. 

But is that worth the significantly higher purchase price (equal to 13 to 15x that of the mobile)?

In case you're not familiar, that means each month's rent should equal 1% of the purchase price.

Networking and creating your "team" of professionals is one part of it, but also educating yourself on the variety of real estate investments and determining which is the best vehicle for achieving your goals now vs. later is equally important.