@Jeffrey Holst Josh Dorkin is the ring leader.

I get mine preprinted at dirtcheapsigns.com  then use roofing ring shank nails with plastic washers and nail them about 8-9' high on telephone poles around town, I use a step ladder to do mine.Any area will have distressed sellers and distressed properties needing repairs and updating.

Some football players have played for life and never got a Super Bowl ring. 

Many shiny happy photos and a warm friendly and thorough description should make your phone ring. 

I also post a copy of the created ad to Craigslist.When the phone rings, answer it!  

I'll second what Mike said about Ring Central too, it's a cool business phone app. 

Offhand, try SLACK, Wrike, Trello, and maybe Ring Central Glip.

I usually present them with a basket of things I want them to use at move in, like assorted felt pads for furniture, a shower squeegee and a clear shower liner and rings if there's no built-in shower door, glass cooktop cleaner or stainless steel cleaner, a pet-safe home perimeter pest spray, and an extra mesh kitchen drain strainer so they have no excuses for a clogged kitchen drain. 

Last year my framers were robbed at gun point while outside eating lunch, neighbor had a ring doorbell and cameras, but really couldn't make the guy out. 

I use the Yale SL, I manage it through my ring alarm/ring doorbell.I have that same lock in 4 houses, haven't had an issue and the double A batteries have lasted over 10 months so far.