Unless you're thinking of opening or buying an electronics store, forget about the big screens.

@Steven Jefferson, I would use the opportunity to get a separate water meter and/or Electronic Metering for each unit.

Got started in the electronics industry when I was 21 and never left. 

@Danae Meurer  Locks- Kwikset Smartcode LeverGarage Door- LAYKOR Keyless Electronic Digital Door Lock YL-99Thermostat- Know everyone says Nest.

Consumers wait to update electronic gadgets when the economy is down.

Laundry facility usage needs to be covered, as does parking, outside storage, and any shared usage of electronics.

You: self-sufficient tenant, can handle minor tasks yourself, can be home to meet contractors, can find and schedule your own contractors, are happy to pay those contractors out of next month's rent, must be willing to do electronic rent payments.   

All rent payments, work orders, everything needs to be electronic.  

Once the rehab is done, I have all the receipts entered into quickbooks by my CPA's assistant and then I have an electronic means to see the profitablity of each project as each one is assigned a class in quickbooks.It has been suggested to me by others to also keep a log/talley of every expense by simply writing each item down in a log book so at any given time, I can see how much has been spent on each project.

I use Dropbox for electronic storage which comes with a scanner in the phone app, so I can scan immediately on the go and then ditch the paper.