It seems like most people are suggesting the brand based account is the way to go, pending the legal clarification of whether it is actually possible to keep a listing active through a sale via a property management account. 

@Mike Terry sounds like a pretty good argument to go after the property, I think your question is more along how to value it, and account for the deferred maintenance. 

I would not want to go for the single-family and then run into a vacancy, as I foresee that could happen as one of the cons.

You're going to have to go learn about that yourself.The faster you get rid of this bozo the better off the whole system will be.

If you decide to go the multifamily route, Real Estate lab .com is a multifamily software for deal analysis plus they have many other useful features. 

However (to go into detail requires a separate post), that's not quite the correct course either.

Yes, had to go in more detail with my answer. $5400 comes with too much risk and wear and tear on the property. 

If you’re looking to buy and hold and get all 3 benefits that’s the way to go.  

It's highly unlikely to go that low again in your lifetime.

I’d revisit the pricing, happy to go over it on a phone call if you would prefer.