My suggestion would be to hold if it’s performing unless there was an opportunity to trade up to a significantly better quality asset, like a B+/A location (GV, Summerlin)

Pick a solid B-Class suburban area.

Is it a B to A location where your business is optimal?

With some extra capital in hand from the home sales, I started focusing more on smaller multifamily units (A and B Class areas) but this time without a partner and with a strategy to use for Airbnb. 

And of course is time for a rent increase (to recover the money spend +, so you are really nothing out of pocket).Option B would be kick him out and remodel the whole place, but that would be costly as some have mentioned and maybe it will kill your cashflow.

(b,c,etc.) 

@Mark Cios I have looked for quads but the ones on the market right now are either a) they are meth/crack houses or b) a little out of my price range just starting out.

Do yourself a favor and shoot for lower returns in the A or B+ class.

And is this absolute/true NNN Depends on the area in Columbus you're going to have a different cap for C,B,A office space.

Building is 2800sqft that sits on a 8200spft lotUnit A 2beds/1bath      Median Rent: $2,045 (Rentometer)Unit B 2beds/1bath      Median Rent: $2,045 (Rentometer)Unit C 1beds/1bath      Median Rent: $1,600 (Rentometer)Expenses:Insurance - $210Water - $400 EstimateGarbage - $100 EstimateCap X - $341.40 (6%)Vacancy - $341.40 (6%)Property Mgm - $569 (10%)Land care - $100Taxes - $874.00What else should i look for in expenses or income?