One difference is occurrence: most apartments don’t have doormen, because they’re expensive (and don’t make sense for a building with just a few units, which is

One difference is occurrence: most apartments don’t have doormen, because they’re expensive (and don’t make sense for a building with just a few units, which is the majority of apartments in NYC). Even in fancier neighborhoods (UWS, UES), I’d guess that less than half the buildings have doormen. And those are neighborhoods with tall buildings with dozens of large apartments.