But it becomes a simple math equation:  $$/month income to replace divided by the average dollars per month per unit owned will equal the number of units you need to own to replace that income and get toward FIRE.  

Do the math:1 - If you keep it as a rental, how long would it take for the CF to equal the profit if you sold it now?

napkin math.

Does the math even warrant you filing a lien? 

It is simple math that the market with higher rent growth will surpass the lower rent growth market with time (such as a long term hold).

Your math depends on conventional loans.

Look, Mark was pointing out that it's self-inflicted injury not some mysterious market factor, that's just reality of the math.

Some math: - $250,000 should be able to buy a storage facility or facilities valued at $500,000. - 20% cash on cash on $250,000 investment would be my target of $50,000.Will y'all point out my fallacies?

You mentioned your math shakes out to 150/month cash flow on a property that costs 150k?

Do the math with local rents and call different property managers to determine if the numbers work then consider your lifestyle and college schedule.