My building has a very safe package delivery location: The roof.
If we could get our packages delivered there, fewer would be stolen, and there wouldn't be drivers trying to get in the front door and failing all day.
If only 10-20% of delivery addresses have such a location, it's enough to start meaningful delivery to those places in cities.
As someone who lives on the -1st floor of a forty floor building I am strongly opposed to this approach - I'd rather have installable balcony landing pads be the required solution.
I think 10-20% might be an overestimate, at least in my experience in the US. I don't think I've ever been in a building that has an accessible roof. Maybe if you could precision target second-story balconies you'd get 10-20% in some regions?
It depends on your locale - in southern cities this number is going to be quite a lot higher than 10-20% since a decent number of even detached houses have flat roofs because snow isn't a thing - but heading into northern altitudes only apartment/condo towers will tend to have a flat roof (and some of them even have peeked roofs due to the snow).
If we could get our packages delivered there, fewer would be stolen, and there wouldn't be drivers trying to get in the front door and failing all day.
If only 10-20% of delivery addresses have such a location, it's enough to start meaningful delivery to those places in cities.