In Rockefeller Center Ho!, published in the Talk of the Town section of the Feb 11, 1956 issue of the New Yorker, John Updike described the discovery of a path from the Empire State Building to Rockefeller Center that didn't make use of 5th or 6th Avenues. Instead he cut through building lobbies, parking lots, and underground passages on his way through the thicket of Midtown's tall buildings.
Recently a pair of New Yorker staffers set out to discover if Updike's journey could still be made and brought back photographic evidence.
A stingy parking attendant refused to let us pass through his gate to Fortieth Street. Faced with no other option, we offered to pay the half-hour fee to park a car; his bemused manager finally let us through without charge.
Many who work in Midtown use shortcuts like these on especially cold days (like today) to minimize the time spent outside while walking from the train or bus. I only worked up there for a couple of years, but I still learned a cut-through trick or two.