My thoughts would be to combine the traditional business of storage or mixed use storage and business or traditional storage with creating a delivery service similar to Clutter (less advanced of course). 

She would like to combine these and roll it over into something self-directed so that it can be invested in RE.

Moving forward, unless it's an emergency, try to combine most maintenance items into several days and send or post a blanket notice stating "building/yard maintenance to be done 5/2 - 5/5; will post 24-hr notice on door if access to specific unit is required"  I have single family detached, so others might have a better answer, but I plan maintenance and send notice to the 3 that are in the same area about a week or more in advance, letting them know I will also inspect their unit on 1st day of that time period, and they can request items inside their unit or leave a list and we will try to take care of it while there. 

@Jo Weiss,The person you should be mad at is the PM who obviously didn't give 2 craps about doing their job, because that's what screening is-- checking and verifying.   

As far as which route to take, there isn't necessarily a right or wrong way, it's just a combination of what you are capable of, what you can finance, and what is available in your market.

Quickbooks and I DO NOT get along.... Any other software out there more user friendly?

but again untested, no historic performance data, the low hanging fruit is being picked off by syndicators then combining assets into opportunity funds so what kind of performance will come from that is unknown. 

Why not buy up a strip of those old crap 4plexes, demo them and put in condos or such?

I put about $30K doing facelift sorts of things and now rents are $850 with plans to go to $925 when the current leases expire.By combining the lots (which costs less than a total of $25K since they were very small and were divided by a county easement which ran right down the middle of the entire property) into one parcel the property is now worth $534K. 

As a buyer, I can use a 203K mortgage to buy a one to four-unit dwelling, borrowing up to 110% of the home value with only a 3.5% down payment on the amount that is determined that the purchase and rehab will be combined.