Mindy - We have key fob access for our buildings. There is a callbox at each building door, where guests can call the residents. The box is programmed to then allow residents to unlock the building door with their phone.
Megan - We use SimplexGrinnell for our key fobs and callboxes. It's great, but there are labor costs to keep in mind - the system we have requires that we take our laptop to each building when uploading new key fobs for residents. Or, if a resident changes their phone number, that's another trip out to the building to update the callbox. Resident loses a fob, that's another trip. I'm sure if we would have known how much time is used going building to building, we would have opted for the networked/wireless updating during the program implementation.