"Third floor. Wrong apartment." - Leonard Hofstadter
Apartment 3A is a room in the the apartment building that is not owned by anyone and is completely empty in Season 10.
- Mrs. Gunderson lives here at least in "The Lunar Excitation" (S3E23). There are often flowers on a plant stand by 3A, including poinsettias before Christmas. Judging by the wall behind Mrs. Gunderson, the floor plan of 3A is different from that of Sheldon and Leonard's apartment upstairs. In the later episode, it appears to be exactly the same layout.
- In "The Gyroscopic Collapse", the military takes away Sheldon, Leonard and Howard's guidance system and leaves the room they work in bare to the floor, the trio accidently walks into Apartment 3A and freaks out because they thought the military also cleared out Sheldon and Leonard's apartment.
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