Start by going to www.narpm.org to search their directory of managers.

As others have said, the best thing your son can do is run far from this deal, buckle down, save his pennies (he probably already is doing this), house-hack, and improve a property with sweat, hard work, developing a DIY skillset, and self-managing tenants. 

Property taxes are 650, insurance 160, outsourced property management takes 10% of the rent, and another 10% of the rent is set aside each month for future repairs. 3750 x 0.8 = 3000. $3000 profit, minus about $2300 in mortgage, property taxes and insurance leaves about $700 cashflow, when I move out.

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

When you say a live revenue manager, what do you mean by that? 

CT is 1-2 hour drive from my location depending on the town and is manageable for one project.

The other tenants would call the management company on Saturday to report the air conditioning failure and were told that a service person would fix the problem on Monday. 

If you have no facts, then yes an appraisal can be your ticket, but also keep in mind how your state manages assessed values.

The property was rented and generated $160 cash flow after mortgage, taxes, insurance and property management fees were paid.

I have two options 6.625% 30 year or 6.15% 15 yearI want to invest aggressively in the near future on more propertiesThe loan is only $110k and the monthly payment for 15 year is $563 and $750I will earn 2-3k a month in gross rental revenueThe property is in a declining population areaRecently rennovated, and all major things were relatively recently improved such as plumbing, the roof, a/c, electric, etc.Will require a lot of management as it is rent by the room so I may switch to a normal rental after 10 yearsI'm trying to find what will mathematically net me the most money in the long run.