Three Twenty One is a practical title for this location, since the number is visible on the curtain over the entrance and the building is used in Seinfeld as the exterior of George Costanza’s apartment building. The address associated with George’s apartment in the series is 321 West 90th Street in Manhattan, and this is the home he lives in before he is forced to move back in with his parents.
Three Twenty One appears in Seinfeld (1989–1998). It is used as the exterior of George’s apartment building during the earlier part of the series, before the character loses his job and returns to live with Frank and Estelle Costanza.
In Seinfeld (1989–1998), the building is seen in exterior shots representing George’s apartment building, with the “Three Twenty One” curtain over the doorway making the location identifiable on screen. It functions in the same way that The Shelley serves as Jerry’s building: as a recurring exterior marker rather than a location tied to a single major scene.
Seinfeld (1989–1998)

Seinfeld
Seinfeld is inseparable from New York in tone, most of the series was filmed in Los Angeles. The series used real New York locations for key establishing shots.
Tom’s Restaurant
Tom’s Restaurant appears in Seinfeld, where it serves as the exterior of Monk’s Café, the regular meeting place for Jerry, George, Elaine, and Kramer.
La Boite en Bois
La Boite en Bois appears in Seinfeld (1989–1998). Rather than being limited to a single episode, the restaurant was used multiple times in the series.
Luke’s Bar & Grill
Luke’s Bar & Grill appears in Seinfeld (1989–1998). The exterior was reworked as Poppie’s, the restaurant connected to one of the show’s supporting characters.

Radio City Music Hall
Radio City Music Hall has served as a prominent filming location for movies such as The Godfather, The Secret Life of Walter Mitty, Rosemary's Baby, and Annie.
Hotel Edison
Hotel Edison appears in The Godfather (1972), Seinfeld (1989–1998), Bullets over Broadway (1994), and Birdman or (The Unexpected Virtue of Ignorance) (2014).

St. Patrick’s Cathedral
St. Patrick’s Cathedral is one of New York City’s most famous churches and one of the best-known examples of Neo-Gothic architecture in the United States.

Times Square
Times Square has served as a filming location for numerous iconic movies, with famous scenes shot in the area.

Empire Diner
Empire Diner appears in both film and television, including Manhattan, Home Alone 2: Lost in New York, Men in Black II, Law & Order, and many more.
Peter McManus Cafe
Peter McManus Cafe appears in Highlander, Radio Days, Keeping the Faith, The Other Guys, Seinfeld, Law & Order, Saturday Night Live, and Broad City.




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