It seems like you have some very solid goals of multiple income streams, and a well calibrated risk tolerance. 

Lots of areas that pencil very well on paper but the quality of renter you will get is going to eat into any profit you may think you are getting.

I can make a post covering that if the Gen AI doesn't explain it well. 

Selling an existing, well-performing asset has some risks.  

Those remote flips and high cash flow rentals are so tempting on paper, but they rarely go well in reality. 

Based on the info in your post, my recommendation would be to turn these assets into well oiled machines and max out their NOI.

*I know the markets really well even better than some local agents.

A well written management contract should clearly spell out what is expected of both the PMC and the owner, to PROTECT both and avoid misunderstandings.

Your plumber/GC should/should have definitely know(n). 

I'd look at that as well as the Zoning Ordinance and Subdivision Ordinance, which every Pa township, borough or city has, or if they don't have those docs, they are covered by the county codes.