Is there something fundamental that I'm missing? 

For one, you can never learn everything there is about REI anyways, so you might as well learn the fundamentals, WAIT, NO, sorry, learn to "Know Thyself" and master yourself through working on yourself, then learn the fundamentals or technical aspect of the Real Estate strategy. 

There is something fundamentally wrong with this and it needs to change.

@Tony SanFilippo In addition to that area going through a lot of redevelopment and revitalization, Kansas City in general has good economic and demographic fundamentals such as population and job growth.

Not suggesting this will be the outcome in every instance, but concur with others that you may want to consider holding if the other aspects / fundamentals of your market remain attractive.

Stay focused on your fundamentals and keep learning.

The reason people get burned by turn key is they don't understand the fundamentals. 

It may give you some helpful advice, and I like it because it covers a lot of the fundamentals of commercial real estate investing.The fact that the sellers sound motivated is great for you (as it is in all investing). 

Does he have 460 hours of on-line classes from fundamentals to Buy and hold, Fix and Flip, Multifamily, Commercial, Land Development and more? 

Thanks, @Neal Collins, you're absolutely right: I'll need to do a lot of homework on the mortgages, taxes, potential fees etc. for any given property.Another big reason I'm doing this is that there are a lot of attractive reasons to go from having an external office for my business (which is currently the case) to having an in-home office that would be tax deductible and essentially give me a discount on my house payment.However, another consideration that I must be careful of is that with seller-financing, a seller can sell the house as-is with possibly a huge number of repairs/some deeply fundamental repair needed.