Understand the fees involved and calculate the total cost for an entire year of management so you can compare the different managers.

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

The number of new listings in the Philadelphia Metro was down 12.9% compared to last October, while sales activity saw a 5.9% monthly decline.Median Sales Price: $304,000 in October 2021, a 9.0% increase over October 2020Overall Sales: 7,834 homes sold in Metro area, down 12.8% from October 2020Median Days on Market: 11, +1 day from SeptemberBuyer demand for homes in the Philadelphia Metro market area was unchanged in October.

If I'm still unsure...Ask a property manager, a realtor, other landlords in the area, search rental listings like you were searching for a rental comparable to yours then adjust up/down based on your condition and amenities.

I was definitely having difficulty justifying 50% down to yield something comparable to a savings account.

Revenue growth isn't tied to interest rates, it's tied to supply and demand in the rental market, plus what other comparable properties are charging.  

Look at mobile homes that are that age already and see what they are valued at and compare to their original purchase price.Is this located in a mobile home park?

What are the advantages/disadvantages compare to other types of real estate investing.  

Paying an attorney is still a bargain compared to a problem tenant. 

Tell them to look at local listings which are comparable in terms of rooms.