It's in a high raise building, where each square feet weights.

They will have property taxes, insurance, upkeep and liability.

Well, last night I lightened up my keychain (felt really weird to not have that weight in my pocket). 

Instead of getting up on the toilet, turning around to face forward (putting 100% of body weight on one side of the toilet in the process), planting both feet on the seat, standing up, and squatting down (for #2 or #1), which will cause the bolts holding the toilet in place to come loose (our toilets are built to assume weight roughly evenly distributed on the seat).

Call a local real estate agent in the area you want to buy in, and ask what the cost of selling an average property will run you and put together a spreadsheet from purchase, to managing, to upkeep to selling.

I care more about the last 3 years of activity, and don't put as much weight on medical bills, because 1 really bad day in the ER can ruin you if you're not really well insured.  

If the owners can't afford upkeep, they may have major roof, floor, plumbing, electric issues which at today's cost of materials to fix and update will cost so much more than the unit is actually worth.

This would be a whole another kind of learning curve, but I can't see paying $122/door in Charlotte for $950 blended weighted rent.

It might carry more weight if you keep it coming from others-can you get her personally involved more?

NPV is the current value of all future cashflows discounted to the WACC ( weighted average cost of capital,  or the interest rate that you borrow at).