Then get out there and network with those who have successfully executed.

You have staff and an on-site manager.

Being an Architect / Developer, who can attest to having visited some of your projects, I can clearly see the vision that was kept alive through execution.

You now need a Note and a Mortgage document executed which spells out all the terms of the seller financed loan.  

Perhaps the PM has someone qualified on staff (perhaps not), but is it really worth it to pay someone >30% of your revenue just to save on the very occasional emergency plumber (or whatever) call?

It's also a common thread among successful entrepreneurs and executives.

That will stop any billable hours going forward.Then contact a realtor who works with investors in your market or a PM to have them execute a lease on your behalf for a small fee. 

That is inverse proportional with the time you put in screening/placing well qualified tenants, executing and reviewing with them proper lease documents and maintaining properties.

You just need to determine your risk tolerance, make a decision, and execute.

It is determined by all parties on the Deed or some other legal form executed by that places ownership with that property involved.