[eigen-vector]

This was introduced to solve this specific problem https://www.amazon.com/b?ie=UTF8&node=17337376011

It requires buildings to sign up though. There are also services like Parcel Pending that solve this problem.

[ng12]

We had one in my building. First package I ever received the door got stuck and I couldn't get it out. Had to get on the phone and wait for a maintenance man.