I've had tenants that screened well bug out owing rent and ones that were a little weak stay over two years with no missed rent.  

@Ian LoewYou just identified one of the biggest weaknesses of the Wiesser / Kwickset smartkey - they do not work in a Master - sub-master - key hierarchy.  

When you agreed to let them move in for half a month's rent and no deposit they knew you were a weak landlord.

(The numbers are my weak points, I think once I figure out the numbers everything will make sense to me)3.

I applaud you for being a good guy but sometimes good guys get taken advantage of because people mistake goodness for weakness.

At 13 years, it is entirely possible there were weak spots due to years of "flexing" as people step in and out, and move about while showering.

My first thought is the renter believes they cannot move out--no money for a mover, too weak//or lazy// to move their belongings.My second thought is they have no money to rent another place--either tapped out of CASH and credit or their circumstances have changed, wife lost original job now makes min wage or something.My third thought is the will stall the move out as long as possible to avoid being couch surfers who must abandon many of their belongings.If they believe they are between a rock and a hard place, they seem to set still on the Rock.For some, Temporary Employment could help them out (provide some cash for expenses).This kind of thing comes with owning rentals (in some areas) for some people, some times.As has been said before this business isn't just Sunshine and Lollipops.https://www.youtube.com/watch?

Wouldn't the latch be the weak point?

Jordan Francis,Most single tenant NNN investment grade credit for strong suburban areas figure on 2 million price point to start minimum with 30% down (600k) and about 40k to 50k in closing costs.There is stuff below 2 million but few and far between and most times it is small mom and pop tenant or small franchisee with weak suburban to rural location. 

Got a Flexbar set to work out chronic carpenter's elbow in both arms?