So I guess it's just coincidence that the stations on the affluent, upper east side will be much fancier with longer mezzanine's than the stations in the poorer communities like Harlem........
The Second Avenue stations put original overbuilt IND stations to shame.
I can't speak to 72 Street since I haven't had the opportunity of working at that station - but 86 Street and 96 Street are overbuilt in non-public areas too.