778 Park Avenue is a luxury residential building located in the Upper East Side Historic District on the north east corner of 73rd Street and Park Avenue.

[1] In 1983 it won the first annual Excellence in Conservation Award from Friends of the Upper East Side.

[2] The building's ground floor maisonette, which also boasts its own private, and symmetrical, address – 73 East 73rd Street – entertained legions of New York City's elite as the headquarters for high-society conservatism with the home's hosts.

[3] Veronica Cooper (née Balfe) married actor Gary Cooper on December 15, 1933, at her mother's home in the very exclusive coop; the wedding had been planned for the Waldorf Astoria hotel, but the location was probably changed to avoid public attention.

The building has been mentioned in James Trager's literary book titled Park Avenue, Street of Dreams[4] and Kirk Henckles' and Anne Walker's book titled Life at the Top: New York's Exceptional Apartment Buildings.