For those who self-manage at a distance, how do you manage keys?

[Brian Berry]

I am seriously considering self managing from several states away. I have nearly every element in place, but I have yet to wrap my head around managing keys to the properties. Specifically, how do I get keys to the various people who will be assisting with managing the properties? I'm not big enough (yet!) to warrant an office where they could be stored. 

There has to be a simple solution...I just haven't yet figured out what it is. 

Thanks!