My firm has a number of property management clients who write their unique properties and firms liability and workers comp with us while writing some of their more standard properties with other agents. 

But interior stairs that require trim work and a combination of oak and pine we outsource.

Bought a 4 unit and a house (two different parcels combined at one point) in Historic Kenwood in 2012 for $139,000.

With that said, @Rochelle Wilkinson your son is in a unique situation; you and your husband both own your own companies, so it looks like the entrepreneurial spirit is strong in your family.

I have something unique there.

In my opinion, the perfect strategy for making solid wealth fast in real estate, is a combination of an active niche (wholesaling, flipping, working as an agent, etc) to build capital, plus BRRR acquisition of cash flowing rentals.

All your comments have been very helpful and I am now putting something together which is a combination of your suggestions.

You can even try to get a hard money loan to buy it, or use a combination of your own money and hard money. 10% will take 10 years to get all your cash back out.

Basically: his cash offer, his seller-financing offer, and a few combinations in between.

Like Mike stated, determine the yield you want and make your offer based on that combined with characteristics of the note and the underlying asset.