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.

Gray’s Papaya
Gray’s Papaya has appeared in several films, including Die Hard with a Vengeance, You’ve Got Mail, Down to Earth, and The Back-Up Plan.

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.

Guggenheim Museum
Guggenheim Museum appears in Men in Black, The International, Three Days of the Condor, Manhattan, Someone to Watch Over Me, and When in Rome.

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.

Tavern on the Green
Tavern on the Green has appeared in An Unmarried Woman, It’s My Turn, Arthur, Only When I Laugh, Ghostbusters, Heartburn, Wall Street, Beaches, and many more.

Naumburg Bandshell
Naumburg Bandshell has appeared in Breakfast at Tiffany’s, Barefoot in the Park, The April Fools, Hair, Kramer vs. Kramer, When Harry Met Sally…, and many more.

Empire Hotel
The Empire Hotel is used in Gossip Girl (2009–2012), Sex and the City 2 (2010), Power and Dexter: Resurrection (2025–).

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.

The Comic Strip
The Comic Strip appears in The Jim Gaffigan Show (2015–2016) and Jerry Before Seinfeld (2017). In both, the club is used in connection with stand-up comedy.




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