A manager will roughly cost $100-$150 a month to take over a unit (it could be more or less in your market) and manage the units.

@Ellis Moyewe really don't know a lot about this situation since there aren't many details in your post... but i don't think this makes any sense for anyone involved here...if it's a flip that's not selling, refinancing may not solve your problem and allow you to pay back the HML in fulland typically a sub to buyer wants a low interest rate... and if you refinance now you won't be getting a low interest rate, you'll just be getting whatever the market offers.and finally.... the vast majority of loans are NOT assumable. 

Find a better property manager.

I'll definitely take a look.

I'm in Columbus Ohio. this mostly applies to 2-4 units used as Airbnb properties within 2 miles of urban core  I have a few friends in Columbus. most do MTR now.

You can refinance into a FHA 203k or like @Jason Wray mentioned you could even use a Fannie May homestyle renovation loan as well!  

Just got off the phone with another DIY landlord looking to hire a PMC.They really didn't like our response to their question, "How long does it take you to find a tenant?"

If I were your age, I would 100% do a house hack of some kind.  

- It will NOT be a once-a-tenant event.

I currently have a background in Semiconductor construction from starting as a detail engineering, working to be a construction manager, and now working as a Modular MEP construction consultant in the span of 5 years.