The Apartment Building



The Building refers to the apartment building at 2311 N. Los Robles Avenue in Pasadena, California, where Leonard, Sheldon, and Penny live. Adjacent to a lamp store, it is located about a block from Pasadena City Hall, which is visible through Sheldon and Leonard's window. The building is also located near a gas station, being that Leonard makes the excuse that he uses its bathroom when him and Penny began seeing each other for the second time in season 5.

The building has at least five floors and sixteen apartments (based on the number of mailboxes). The Elevator has been broken for several years, after it was damaged by one of Leonard's experiments involving rocket fuel, as explained in The Staircase Implementation. The building also contains a laundry room in the basement.

Production
During the initial production of The Big Bang Theory, Chuck Lorre stated that the set department had built him a stairwell with three walls, and he didn't know of what to put on the third wall being that it was the most visible. One of his producers suggested that Chuck Lorre put in a broken elevator, which would add to the reason why the characters had to use the stairs.

The only separate sets built for the apartment building (albeit the apartments) are the lobby (ground floor), the laundry room, and the roof. The stairwell is the same set for all shots, but accessories and details are changed inside the hallway between each scene filmed to create the illusion that the actors are ascending or descending each floor.

Layout

 * Basement – The laundry room is located here.
 * First floor –The first floor contains the lobby, which is the entrance to the building. It also contains the mailboxes of the residents who live in the building. It also has a hidden from sight doorway that leads to the laundry room in the basement. This also contains the elevator doors that say out of order, or have the caution tape over them. It's also suggested that the first floor has unseen apartments on it, being that this is the floor which housed tenants of which Leonard buys the couch from for a hundred dollars when they were moving out.
 * Second floor - The second floor has a bicycle in front of the broken elevator door, and a water jug by 2A. Mrs. Grossinger lives in 2A
 * Third floor - There are often flowers on plant stand by 3A, including poinsettias before Christmas. Mrs. Vartabedian lives on the third floor. Mrs. Gunderson lives in the apartment 3A.


 * Fourth floor
 * 4A (Sheldon and Leonard)Aparementbuilding.jpg
 * 4B (Penny)
 * Fifth floor
 * Alicia lives in the apartment 5A as of season 3.
 * Roof – There is a 3 foot gap to the next building, access to the roof and enough room to set up astronomical experiments. This is also the location that Howard and Bernandette were married.

History
The earliest version of the building is seen in the episode "The Staircase Implementation".

Residents
The first resident of the building that we see in The Staircase Implementation is Louie/Louise when Leonard accidentally knocks on his the door to his 4B apartment instead of Sheldon's, 4A. We also catch a glimpse of Sheldon's former roommate exiting the (then functioning) elevator, and he warns Leonard about Sheldon. We also know that there is an apartment opening up on the first floor being that Leonard buys the sofa from them for a hundred dollars. As of the fifth season, Sheldon has been living at 2311 No. Los Robles for eight years.

Penny is moving into the building during the Pilot episode, and Alicia moves into an apartment on the fifth floor during Season 2.

The Elevator
In "The Staircase Implementation", we learn that the elevator was working at this time being that Leonard uses it to get to the fourth floor. We also learn that Leonard had miscalculated the formula for an experiment that he was doing with government grade rocket fuel that he was developing. Seeing that the cylinder was about to explode, Leonard attempted to take it out of the building, via the elevator. Sheldon knew that Leonard would not have time, so he pulled Leonard out of the elevator and closed it with the cylinder inside. The cylinder exploded and permanently disabled the elevator. Leonard considers himself being in Sheldon's debt not only for saving his life, but not telling the landlord or the government about what happened. This is the reason why he chooses to live with keep living with Sheldon.

Where is the building located?
The building is located in an entirely fictional location according to Chuck Lorre. He states that the views from the apartment windows were simply pictures of Pasadena taken for the production of the show. Some fans have attempted to pinpoint the exact location of the apartment building, but nothing has been confirmed as accurate. While there is a No. Los Robles Avenue in Pasadena that is in close proximity to Pasadena City Hall, the area is mainly a residential suburban community and there are no known apartment buildings in the area.



Referencing the photo at the top of this page and the speedy zoom at the end of The Countdown Reflection, the location of the building used to represent the apartment complex for the Google Earth shots is 215 Madison Avenue, Pasadena, California. However, this is not meant to indicate any real-world connection.