I know it's a bit pricey, but it handles everything from leases, electronic signatures, rent collection, maintenance requests, and accounting

My town has electronic water meters that provide the city a lot of info so they are able to see when something like this is happening. 

For my rental properties, I have a keyed deadbolt and a electronic keyless entry pad on the front door.

Just have a worthy real estate group that is willing, on the properties you buy using them , to set up electronic payments and late fee schedules.

We also have our HELOCs and primary bank accounts through the same bank, so are able to electronically transfer funds in and out of accounts daily (hourly if we wanted), which we do (quite often daily) to take $$ out of accounts with larger availability of funds to pay down HELOCs with interest rates, to save interest on a daily basis, and then retransfer from the HELOC back to the primary account when it's needed to pay bills, etc.

I use a dedicated bank account and credit card and email account (for Home Depot electronic receipts).

Some of the resources I've gotten used to tapping:1)County property tax records to show who's currently being billed (not always to the same address as the property) and any chain of title it shows.2)County clerk's online records to show actual deed and deed of trust documents electronically scanned.3)truepeoplesearch dot com, which I've found to be a good, free resource for looking up records by person, by address, or by phone number, and any person it has information on will show associated relatives, maiden / married names, address history and phone number history. 

Millions of houses are in a POOL with millions of other houses in MERS (Mortgage Electronic Registration System) so that Wall Street Cats can get fatter, which is illegal because it separates the note from the mortgage making it an unsecured debt. - Can you say "Bifurcation"?.  

His analysis helped my realtor determine her marketing strategy.In my case, my "core knowledge" was the electronics industry.

The solution there was to switch them to electronic payments which was a night and day difference, they haven't been late since.