Initially the credits sequence used a large black and white photograph of the building. The photograph was set up in the studio as the camera panned from one apartment to the other.
Occasionally the credits would appear in the wrong sequence, placing characters in the wrong flat.
All dates, times, events and persons depicted are fictional.
Dive back into your favorites as we round up all the best series returning to TV and streaming in 2021.
It's not too late to join in the conversation on the buzzworthy shows that IMDb users can't get enough of. Catch up with our recommendations.