It is surprisingly easy to manage out of state and if you want more tips on how, check out Bigger Pockets book "30 Day Stay" on Mid Term Rentals. 

No management costs?

My partner and I have a couple units we manage as well in Washington DC.

Most commercial brokers have no interest in wholesalers and neither do their clients.

REI investing for almost 20 years, owning a wealth management company for 22 years, suffice it to say there has been a lot go data/spreadsheeting/tax analysis/meeting with my team go into this overall decision to sell the entire portfolio at once.  

Commercial is a different beast and would not go at that out the gate without some experience first. 

Top 3 reasons owners hire PMCs:1) No time to manage correctly2) No time to learn how to manage correcly: laws, documents, processes, etc.3) They're too nice and need someone to "save them from themselves"A good PMC can usually earn their fees by better managing the property/tenant than the owner, thereby:1) Increasing owners net profit2) Decreasing owner's time commitment, stress, headaches, etc.No matter what though, you should always plan to commit a couple of hours a month to manage your PMC.

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases.

I'm certainly cognizant of the risks of managing a property remotely (my wife and I did rent out our Chicagoland house for a couple years while living in STL).

in Oklahoma is a real estate license required to manage properties?