For example:Keep electronic copies of whatever you can, have your tenants pay rent online, minimize clutter and keep in your home only what you need.

I'll invite someone I just met electronically from my business school who posted in an alumni group: "I've used the same broker a handful of times now for buy-to-let & residential purchases and remortgages.

Most properties have electronic lockboxes that you can't access.

., set it up with a key box, electronic lock, or convince @Joshua Dorkin  to handle keys for you.

I guess I could use some sort of electronic lock.

I was under NDA and an officer of the company for the private family when I was working for as COO at Arrowhead Products as well Crane electronics so I can't discuss... 

I prefer sticking to "stupid" electronic locks.

In the email I cover the basics of what we discussed  (price, terms, closing etc) and ask them to call before they electronically sign.

Obviously things like inspections and inventory of what's being left behind (furniture, electronics, etc.), is important as well.

You simply post the bill and then send them an electronic bill for their portion of the bill based on square footage.