I use the LRO to get snapshots of each market and the snapshot gives me Occupancy %,Effective Rent ,Annual Rent Change, Concessions, Supply, Absorption,Existing Units + the Michael Blank Deal Analyzer + rentometer + Marcus and Millichap + Milken Institute( for more accurate market info ).

For instance, I know exactly what types of tenants (ages, occupations, income levels, even political affiliations) are attracted to various neighborhoods within my city--and I know exactly what types of properties those tenants will (and won't) want to rent. ...most macro data doesn't show you that level of detail....and that's just market-level data.

Occupancy date3.

And it would be prudent to be able to comfortably affort the new REFI payment without considering the new income from adding that debt.Another idea:  house hack,  by buying another primary residence with a new occupant loan, keep the house with the NACA loan on it as a rental. 

Theory and reality are two very different things, especially as increasing competition drives down occupancy and nightly rates in most markets.For the vast majority of people, the most likely thing it will generate is huge amounts of future risk

You teach him to fish and you give him an occupation that will feed him for a lifetime.I have a 13 year old and an 11 year old, who already know how to fish, and I want to teach my boys the ins and outs of real estate investing.

In that case, you may have trouble getting the property for your offer price because the current homeowner would have a lot of incentive to get a higher price by either replacing the roof themselves before selling or offering a credit at closing to an owner-occupant buyer willing to replace the roof.

Even in the worse case scenario of a 0 occupancy I could carry the full mortgage.I know this is a pretty big leap from nothing to home owner. 

I have some background on her occupation in the service industry.

For example, a penthouse suite in Chicago renting for $4k -$6k a month, needing $20,000 in furnishings, but seems to get no less than 50% occupancy at $1,000 a night...sure, it's a lot more upfront and quite a commitment to rent such a place, but the revenue is so much larger...