Apartment 4A

Apartment 4A is the apartment where Sheldon and Leonard live situated an apartment complex at 2311 N. Los Robles. The apartment, described by Howard as nerd heaven, is full of nerdy games, action figures and everything else that cool. 4A is across the hall from Penny's apartment, number AB.

Layout
The Apartment has Leonard & Sheldon's desks along the fourth wall, with a row of bookshelves along the left wall, with a small closet. The TV is also along the fourth wall, with the sofa & chairs in the middle part of the apartment. The kitchen area is on the right side of the apartment with a large refrigerator.

The back part consists of a large window with a large additional desk near it. The Apartment also has numerous whiteboards spread through it. There is a small hallway leading to the Bathroom as-well as Leonard & Sheldon's rooms.&nbsp

Bathroom
In the Agreement Dissection it is revealed that the shower has a cover with the periodic table imprinted on it. It also has many pictures on the walls portraying superheroes.

History
In The Staircase Implementation, through a flash back, we find out that Sheldon lived in the apartment before he met Leonerd, where he had another flatmate who got so annoyed with living with Sheldon that he spray painted "Die Sheldon Die" on the wall and moved out.

Sheldon and Leonard met for the first time when Leonard came to view the apartment and after passing Sheldon's questions he moved in, and has lived there ever since.