Apartment 4B

Apartment 4B is the secondary setting of The Big Bang Theory. It formerly belonged to Louie/Louise, then Penny, and then Sheldon and Amy for the last three seasons of the series. 
Penny was mostly living alone in the apartment prior to her eventual husband Leonard moving in, but they still spend most of their nights in Apartment 4A due to Sheldon having had a hard time with Leonard moving out. It is located on the fourth floor of the Building at 2311 North Los Robles Avenue, Pasadena, California. When viewed from the satellite photographs in "The Countdown Reflection" episode it appears to be located at 215 South Madison Avenue. It is most well known as being located directly across the hallway from Apartment 4A, which is the apartment that Sheldon lives in and in which Leonard also used to live in with Sheldon as roommates though the married couple spent many nights there. Sheldon and Amy used it for a five-week experiment in living together and then formally moved in together. It is known that they spent their first year as a married couple here, but they eventually moved into their own house as seen in the "Young Sheldon" series finale "Memoir", being a well-deserved upgrade after winning a Nobel Prize. 
==Layout==
4B is a smaller apartment than its counterpart across the hall, having only a single bedroom instead of two; however, like its counterpart across the hall, it has an open floor plan where the living room and the kitchen are part of the same room. Also like 4A, the apartment is entered into the living room through the hallway. The right wall has a single door that leads into Penny's bedroom. Continuing along the wall is a large window with her kitchen table by it. The bathroom in the apartment is an ensuite located through her bedroom, and is the only way to access the bathroom.
The wall on the left immediately after you enter the apartment is not visible, as it is the view into the apartment when episodes are being filmed. The wall houses Penny's TV and entertainment center and her portrait of her and Amy Farrah Fowler, and ends at the kitchen area.
In Penny's kitchen, there is an island with chairs as well as a small window over the sink.
==History==
Apartment 4B is first seen in the pilot, upon meeting Penny, who is the newest tenant in the building. We also find out that the former occupant of 4B was "a 200 pound transvestite with a skin condition". This former occupant's name was revealed as Louie/Louise in the following episode called The Big Bran Hypothesis. The Big Bran Hypothesis also gives us the first view inside the apartment, in which Sheldon and Leonard help move in a media set while Penny is at work. Sheldon describes Louie/Louise as being cleaner than Penny, having helped him run cable for a web-cam while he lived there. 
Sheldon and Amy move in the apartment in The Cohabitation Experimentation.
Note: When Leonard first sees Penny through the doorway in the Pilot, the kitchen should be visible, but is not. Only the coffee table that is still in front of her couch can be seen in her full apartment set.
==Appearances==
Penny's unit is featured in:
* [S01E02] The Big Bran Hypothesis - Sheldon cleans her apartment
* [S01E08] The Grasshopper Experiment - Penny mixes drinks
* [S01E16] The Peanut Reaction - Preparing for Leonard's birthday party
* [S01E17] The Tangerine Factor - Penny's breakup with Mike/Leonard's help/also talking to Sheldon
* [S02E03] The Barbarian Sublimation - Penny plays Age of Conan
* [S02E09] The White Asparagus Triangulation - Sheldon questions Penny
* [S02E11] The Bath Item Gift Hypothesis - Leonard is angry about David Underhill
* [S02E12] The Killer Robot Instability - Leonard begs Penny to talk to and forgive Howard
* [S02E14] The Financial Permeability - Penny's financial crisis/power shut off
* [S02E15] The Maternal Capacitance - Penny and Leonard try to avoid Leonard's mother
* [S02E18] The Work Song Nanocluster - Penny starts a business making Penny Blossoms
* [S02E20] The Hofstadter Isotope - Sheldon & Stuart argue over Batman's replacement
* [S02E21] The Vegas Renormalization - Sheldon locks himself out of his apartment
==Items Found in the Apartment==
Penny's apartment has been described as an explosion of an IKEA catalog. Many of the items found in her apartment are from IKEA; however, most of them have been altered with new upholstery, paint, coverings, etc.
Penny's Living Room:
Orange director's chair
Purple picture frames
 Wisdom of the Birds painting by artist Dan Gottsegen
Skruvsta swivel chair
 recovered in green and white
Klippan Loveseat
recovered in teal fabric
"The Victorian Bird" by Papaya Art
Ikea watering can 
 Birch Lack Coffee Table by Ikea
 Lunta lamp from Ikea
(painted orange)
Bjursta extendable table 
Nordmyra chair at the desk
(painted purple) 
"Painter's Palette" multi-colored Soren chair from Anthroplogie (discontinued)
Purple Bijoux lamp 
with plain lamp shade
the green couch cushions are called Hanna Slinga, from Ikea (discontinued)
 
Known rooms:
* Amy and Sheldon's room (formerly Penny's room)
* the living room
* the kitchen
* the bathroom
Penny's Kitchen:
* light blue tea pot [S01E02]
* yellow and blue bowls
* yellow coffee maker
* wood and steel paper towel holder
* salad plates on the wall are from Anthropologie's "Verdant Acres" collection (discontinued - check eBay)
* lime green plastic PackerWare tumblers, seen in the episode "The Grasshopper Experiment". They appear to be discontinued.
Penny's bedroom:
* Bed linen set: Kumala Rose from Anthropologie (appears discontinued)
* Sheets, solid light blue, among others: from Bed, Bath & Beyond
* Bed: custom design by Shea
* Rugs: Urban Outfitters
* Curtains: Pier One
* Bed table: IKEA
* Lamps: Lamps Plus
** the one on the nightstand is called "Purple Bijoux" table lamp
** Penny has added a lighter colored lamp shade
* Multi-Colored paper lanterns: Creative Converting
* Sconces: Brown & Gold Lighting
* Artwork: Katie Hinton print
* Sterilite Ultra Rectangle Laundry Basket, white
==Layout==
Fall of 2016 marked Sheldon and Amy's five week experiment followed by them officially moving in together. Later they started redecorating, but the furniture setup remains the same.
==Gallery==
The weekend vortex leonard, penny and sheldon.jpg|Penny's living room.
The weekend vortex leonard, penny.jpg|Penny's kitchen area.
The weekend vortex penny and sheldon.jpg|Penny's living room.
Apartment 4B.jpg|Penny's living room. First season.
Louie - Louise.jpg|Louie/Louise - tenant prior to Penny.
Pennys bedroom.jpg|Penny's bedroom.
Pennykit.jpg|Penny's kitchen area.
Pennydining.jpg|Penny's dining area.
Pennyapt.jpg|Penny's living room.
S6EP02 - Sheldon in Penny's bedroom.jpg|Sheldon invading Penny's bedroom while she sleeps.
TBBT 6x03 Penny and Amy 2.jpg|Amy and Penny hanging out in her living room.
The Decoupling Fluctuation Penny and Leonard.jpg|Penny & Leonard having dinner in her dining area.
Wat5.png|Sheldon aghast at Penny's apartment.
pennys_bedroom.jpeg|Penny's bedroom
TheVictorianBird.jpg|The Victorian Bird artwork on Penny's wall|linktext=The Victorian Bird art piece.
Bed.png|Penny's bed.
REfrig2.jpg|Pictures on Penny's Frig - May 2014.
Refrig21.jpg|Penny's Frig Photos.
PennRefrig.jpeg|The Frig.
PennApt22.jpg|Penny's living area.
PenBed3.jpg|The bed.
PenBed.jpg|Penny's bedroom.
Kittt.jpg|The kitchen of 4B.
BernApt.jpg|Penny's couch.
V86.png|From the back of her door to her bedroom in 4A.
V14.png|Her refrigerator Fall 2016 - just prior to Shamy moving in.
BTS - BBT - poster and toy.png|Sheldon's touch in the 4B living room. 
Last12.png|Last day of filming.
Last11.png|Penny's apartment door.
es:Apartamento 4B
pt-br:Apartment 4B
Category:Locations
Category:Film Sets
Category:Permanent Sets
Category:The Apartment Building
Category:Residences
Category:Penny
Category:Howard Wolowitz
Category:Apartment 4B
Category:Reference Materials
Category:Season 1 (The Big Bang Theory)
Category:Season 2 (The Big Bang Theory)
Category:Season 3 (The Big Bang Theory)
Category:Season 4 (The Big Bang Theory)
Category:Season 5 (The Big Bang Theory)
Category:Season 6 (The Big Bang Theory)
Category:Season 7 (The Big Bang Theory)
Category:Season 8 (The Big Bang Theory)
Category:Pasadena
Category:Season 1 (The Big Bang Theory)
Category:Season 9 (The Big Bang Theory)
Category:Rajesh Koothrappali
Category:Season 10 (The Big Bang Theory)
Category:Leonard Hofstadter
Category:Sheldon Cooper
Category:Amy Farrah Fowler
Category:Penny's Posse
Category:Bernadette Rostenkowski-Wolowitz
Category:Season 11 (The Big Bang Theory)
Category:Season 12 (The Big Bang Theory)