That’s way more than the population of the whole town I live in.
There’s a good chance that apartment building has easy to find organized unit numbers that pizza delivery guy can understand. Building may even have multiple front entrances each with distinct addresses.
Once saw a (German) documentary about this building. They have drop-off places on the ground floor where delivery drivers leave their goods in locked boxes. Payment and and locking/unlocking of the box is done digitally through phone.
P.S.: This one https://www.youtube.com/watch?v=PgVXPEORuA0
I have in-laws living in China, and honestly - it’s a lot easier to navigate those sorts of high rises than you might think.
Most residential buildings I’ve visited have lots of dedicated lifts, so only 2 apartments per floor share one lift. So you would only need to provide something like: Tower 37, Floor 19, Apartment 2.
The Chinese love their delivery apps, too - their drivers (technically scooter riders) are very used to this.
Now the city of Chongqing is a whole seperate matter, that place is an M. C. Escher drawing in real life!