BRRR gives you the opportunity to step into the market with a lot less risk because you have more time to pick your exit. 

It is a risk, however, I don't think it happens often because lenders are generally satisfied as long as payments are being made.You ask about doing this on a rental property.

My  husband leans towards wanting to pay each rental off at times, instead of re investing.Hes not as big of a risk taker as I.... 

Converted single-fams to plexes have a lot of inherent risks and problems. 

Those items are just some of the non-insurable risks we take as landlords. 

Don't overdose on what I call "education overflow addiction". 

Ultimately it's what is the return you are getting versus risk,capital deployed, and what is the timeline and headache to achieve it?        

A-class also seems most susceptible to supply risk.

It has been often suggested here and elsewhere to pursue something that keeps a toe in the water of the working world, as it limits the downside risks, and could turn into a fruitful enterprise for post-retirement.At the request of a friend and BP associate, I've been asked to provide expert opinion and electrical analysis on residential properties that are either on the market, or recently sold through his brokerage, as there are many customers who want a deeper look at their electrical system, deeper than what a typical home inspector will do, but they are not ready to ask a contractor to come out and simply give a blank check to 'fix whatever's wrong' (famous last words).

My opinion is that this is really a personal choice and a factor of you and your wife's outlook on risk vs. opportunity.