Today we installed the new (used) front door that we found at Home Emporium (a type of building reuse store) yesterday for $100. The old front door was steel and dented and rubbed against the brick wall inside. It also screamed "vacant" and "ghetto."
And this past Wednesday evening we drove by and found the steel door wide open. No one was inside and no damage had been done nor property stolen, so we suspect that the strong winds that day had jiggled the door enough to open it! I know it sounds crazy, but the lock on that door had gotten so bad that we had to jiggle it to lock and unlock it...so maybe the wind could have blew it open...?

The new door, while probably not the last door for the space, says "don't sit on this stoop because someone might use this door!" :)