Not all services can provide you that service as it's a double skip process, or they charge more. 

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What you do is charge the 1400 per month.

On the other hand, I’m hesitant to simply pay down more of a property, as we don’t need the immediate cash flow.Fortunately, both my wife’s job and mine are recession-proof, which allows us to be a bit more aggressive with our investments.I’d really appreciate advice from investors who have experience with frequent moves or military service.

Most PM's in Columbus will charge you 7-10% of gross rent as PM fee's + maintenance costs. 

Do they charge a fee since there is no commission on their end?   

I agree on no-charge when unit is empty.

The one I worked with and fired in Jacksonville charged 8%.

Tenant(s) name(s) and contact information, start/end of lease, rent rate, pets, kids, etc.Create a section for tracking rent charges and payments.

The challenge was finding a GC that had good communication and understood ROI for every dollar he charged us.