You would have to go after the one individual for non-payment and you could only remove the other three by going through the legal process like you would for someone on a verbal agreement, which puts you in a he-said, she-said situation. 

You need to take a look at your financial situation.

A straightforward way to estimate value is by looking at the price per square foot and using that to calculate your property's worth.In situations like this, it's worth spending a couple of hours yourself to get a solid understanding of the market.

@Frankie Paterno I have talked with a number of investors in your situation. 

STRESSED!

So I had a windfall and can sort of "semi retire" with a part time low stress job. 

With this said, I do consider the situation. 

Additionally, take time now to build relationships with reliable vendors and contractors; having a go-to network for maintenance issues will save you time and stress.

Your property is fairly destruction proof, costs near nothing to maintain, yet you can charge above market rents.If your property is nicer (class B) where the carpet alone might be $6k or more to replace when the tenant spills hair dye everywhere, you won't be as happy as in the situation above.  

The technicals (migration rates, job growth, tax situation, debt cost, etc) to work as well.