A property manager at least can handle things professionally with experience built over years.

I'm guessing that's a big yes... now of course too as long as you can handle the payment, have some repair reserves etc. even if you're not cashflow positive. 

If the developer's Purchase Agreement allows, you could have a Realtor list your townhouse on the MLS for sale.Otherwise, some Brokers belong to several hidden or secret Facebook groups in which we can advertise properties for assignment sale.

Another point is, after over 40 years of handling tenant complaints, vacancies, large repairs, (last year my repairs totalled $111,618)  Maybe it's just time to scale down and lessen the headaches (I have 5 vacancies right now). 

With one or two uncomplicated rentals, though, you really shouldn't be paying a CPA more than $1000 to handle your local, state, and federal tax returns.You find your lawyer the same way, by poaching an experienced investor's real estate lawyer.

Also, I agreed to handle any repairs under $1500.

Hello, I'm interested in understanding the responsibilities of a property owner that would not be handled by a property manager (or that would be a la carte items).

What's the best way to handle this?

If the tenant has an active renters insurance policy, most likely, their policy would handle the displacement.

Let you PM handle everything.