Also we would make provisions that would enable my mother to call a portion of the loan due at one time to cover her retirement/expense, i.e. $50,000 in any 1 year period.

This enables you to take maybe 2%-3% back off the sale.

obviously depends on goals, but I would suggest the mortgage, as leveraging the investment will bump up your ROI and enable you to use excess cash to buy more

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He liked the concept which enabled me to complete the purchase. 

This right enables the Service to redeem the real property from the party who purchased it at the foreclosure sale, and then sell it.

I am a musician serving in the Army—a job I've been doing for six years.

You have zero control over the investment and hopefully will make good choices that will enable your investment to grow over time.

I am a musician as well.

This has been long-standing and he seems like an enabler.