129 Sesame Street

129 Sesame Street is the address of the apartment buildings located above Hooper's Store on Sesame Street. 
The apartments had not been given a specific address, like 123 Sesame Street, for most of the show's run. In Episode 3991, they were acknowledged as 456 Sesame Street (an address that had previously been used for a building Around the Corner). In Season 50, the building was blessed with a new address (embossed on the front entrance window).
The apartment above Hooper's (numbered 2BEpisode 2799 and Episode 3365) was originally home to Bob, who would host frequent music lessons from his living room. The room has a window overlooking the yard.
In Episode 4131, Gina's apartment was relocated to the building. Later on, Charlie and her family moved into the building. In Episode 5203, Chris is shown to be living in the apartment above Hooper's, and later, Prairie Dawn is shown occupying the same apartment in Episode 5435.
In press statements regarding the changes for Season 46, Cookie Monster was said to be now residing in the apartment directly above Hooper's,Sesame Street Unveils Exciting Changes to its Iconic Set During Production of the Landmark Television Series’ 46th Season (archive link) however no recorded material has appeared on the show depicting this fact.Sesame Street Art Department on Instagram It has also been reported, but not presented onscreen, that Joey and his family are tenants as well.@sebastianoricci on Instagram
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