Genteel Fifth Avenue at the turn of the century

Could this really be Fifth Avenue in the 50s, today one of the most expensive stretches of retail in the world?

The street sign appears to read 52nd Street. That means the two mansions on the left belong to the Vanderbilt family, as does the French chateau-like mansion next door.

That’s the Fifth Avenue Presbyterian Church at 55th Street rising in the center of the postcard.