[baddox]

In all seriousness, there's no reason that homes or apartment complexes couldn't have fairly standardized drone landing pads. Clever people could probably rig up some sort of simple elevator to bring the shipments inside. Incidentally, the landing pads could also be marked in a standard way to assist in computer vision controlled automated landing.

[kybernetikos]

And if you provide a charging point and allow the drone to charge, then delivery is free.