An IRA is an individual account and is not sponsored by a business.A business, for the purpose of sponsoring a 401k, can be any type of trade or business that is carried on.

I understand it may be personal risk tolerance preferences, but if there is a general consensus or rule of thumb that would help.

If I can get some opinions on inherent risks associated with this as well as any ways to mitigate them that would be much appreciated!

My duplexes do receive an income approach to value when appraised, but because it is residential, the comps carry much more weight. 

What are the risks involved with that?

Luckily that individual only put their own money at risk instead of a clients. 

The only reason I would see to not keep a perfectly performing cash flowing property would be drastic uncertain market conditions, need for funds, control more debt, or to lighten risk. 

But I'm wondering if there is a better low-risk option for that money, which is just sitting there for a rainy day, that would help it grow on its own over time and allow me to withdraw funds as needed.  

I’ve had good luck with owner/seller carry contracts.

Say you sold for $100K and took $20K down and carried a note for $80K.