[2][n 1] The delay was due to difficulties in purchasing the site for the station building and agreeing a safe layout of the passages below ground with the Board of Trade.

[3][n 2] The surface building was designed by the Underground Electric Railways Company of London's (UERL's) architect Leslie Green in the UERL house style of a two-storey steel-framed building faced with red glazed terracotta blocks, with wide semi-circular windows on the upper floor.

[6] Down Street was never a busy station, as the surrounding area was largely residential and its residents mostly wealthy enough to travel by other means.

[7][n 3] Additionally, the neighbouring stations were being rebuilt with escalators in place of lifts and their new entrances were even nearer to Down Street, further squeezing its catchment area.

[9] The station was selected for use as an underground bunker in early 1939 as part of a programme of developing deep shelters to protect government operations from bombing in the event of war.

[9] In April 2015, Transport for London announced that it was seeking proposals for the commercial use of parts of the surface building, disused lift shaft and underground passages.

A much modified and expanded version of the station appears as a part of a level in the video game Shadow Man, which was used as Jack the Ripper's hideout.

[18] The British band Hefner released a song titled "Down Street" on their 2006 album Catfight; according to its sleeve notes, it is set in the early 1930s and tells the story of two lovers who meet at the station.

[22] Down Street is mentioned in The Man in the Brown Suit and The Mystery of the Blue Train by Agatha Christie, and Neverwhere by Neil Gaiman.