Rent is due first or before the first of the month or they get hit with a late penalty.In today's day and age of electronic payments there's no excuses to not paying on time.  

Our business uses Echosign for electronic signatures.

The trend is for software to be delivered electronically and not in a package of atoms.  

This is cheaper, at least in the short run, than user-rekeyable locks from Kwikset, Schlage and possibly other manufacturers.For more money, you could invest in electronic keypad locks and even some that allow remote control.

They take the 9V batteries out of their smoke detectors to use in their latest electronic toy.

Once I receive any documents via email I will print them out for our hardcopy filing system and put them in our electronic filing system which we share via dropbox.

You stated: "despite sometimes being late on his half of the rent".I don't know about the rest of you, but I demand rent in full in 1 form of payment (1 check, 1 electronic bank transfer, 1 money order, etc...).

Everything is automated, contracts can be electronically signed, essentially paperless.

I got an incomplete electronic file with purchase.

Many of them have the realtor lockboxes that require an electronic key, and you can only get that if you're an agent (or an agent illegally lets you borrow one).For that reason -- along with the tens of thousands of dollars you can save/make on commissions -- you should think about getting your license.I don't know any investor who's done it who regrets doing it...