I think it's common to have a negative view around personal debt and to want to pay it "as fast as possible," but it really all depends on your investment options and their corresponding risk-adjusted returns.Someone mentioned it already, but regardless of which direction you take, I think priority #1 should be to refinance your student loan debt for a lower interest rate.

If absolutely no one can pull it off find a local investor that is willing to let you do some light management for him: collecting rent, showing a unit, or correspondence with tenants or contractors and use that to satisfy the requirement.

If you're going to manage it yourself definitely get a google voice number; email & physical address for correspondence.    

What zip code (s) correspond to Oak Park / East Sac?   

Very important as doing deals and all the correspondence required to do them is difficult if it's hard to communicate with the person and they aren't tech savvy.

Because of this, I would again not want to co-mingle two separate businesses and the corresponding liability each brings on.

For what it's worth I don't ever correspond with potential renters via email or text, they have to phone call me so I can talk to them to set up a showing (which will be a group showing - and it will be a group showing that they don't know it will be until they get there and discover it for themselves by seeing other potential renters there at the same time, we never ever do an open house, and especially never on a weekend, if people aren't interested enough to set a specific appointment to look at the place I don't want to waste my time with them).

Make sure you have a contingency plan for when the old man dies.  

A reduction in the annual percentage rate with a corresponding change in the payment schedule.3.  

Always correspond via email so there is written record to bring suit in the event of misrepresentation.6.