107 Baker Street

107 Baker Street, postcode W1U 65P, (AUDIO: Fugitives) was a house in London owned by the Doctor from at least his fourth incarnation, and used by him and his companions throughout the 19th, 20th and 21st centuries.

Layout
The house was multiple stories tall, (AUDIO: The Haunting of Thomas Brewster) and had a secret cellar, a priest hole, a parlour and a larder. (AUDIO: The White Room) By 1980, it had a television with three channels. (AUDIO: The Movellan Grave)

19th century
The Fifth Doctor owned and lived in the house from November 1866 to November 1867 while making repairs to the TARDIS. (AUDIO: The Haunting of Thomas Brewster)

In 1894, the Sixth Doctor, using the alias "Professor Claudius Dark", told his friends Henry Gordon Jago & Professor George Litefoot to go to the house dressed as the fictional characters Sherlock Holmes and John Watson. There they met the creator of the characters, Arthur Conan Doyle, who had been told where to meet the investigators by "Professor Dark". (AUDIO: The Monstrous Menagerie) During their stay there, they were joined by Ellie Higson, who helped them to defeat Remorse. (AUDIO: The Night of 1000 Stars)

Jago and Litefoot later visited the house to leave a message for the Doctor to visit them. (AUDIO: Masterpiece)

20th century
In 1918, Molly O'Sullivan stayed in Baker Street after leaving the front lines. After she left with the Eighth Doctor, Molly gave David Walker the keys to the house. (AUDIO: The White Room) David lived in the house until the 1970s. In the interim, he married a woman named Isabelle and they raised their two sons, one of whom was named Nigel, in the house. (AUDIO: Eyes of the Master)

In the 1920s, River Song stole the Doctor's TARDIS, left at Baker Street by the Fourth Doctor. (AUDIO: Whodunnit?) Indeed, the Eighth Doctor avoided the house during his time in 1921, due to its use by his fourth incarnation (AUDIO: A Life in the Day) after he'd been stranded in 1917 with his TARDIS in 1922. During this time, the Fourth Doctor Romana had been staying in the house, where they'd received cryptic notes from the future Fourth Doctor in the attic. (AUDIO: The Haunting of Malkin Place)

In 1940, the Eighth Doctor parked his TARDIS at the house, because he didn't trust Churchill having access to the TARDIS. Churchill later had himself and Liv Chenka driven to the house, so Liv could contact Heliyon from the TARDIS. (AUDIO: Their Finest Hour)

Earlier in their respective timelines, the Eighth Doctor and Liv stopped at the house in 1963. (AUDIO: The Red Lady)

Due to the interventions of Kotris, (AUDIO: Eyes of the Master) by 1970, the house was the base of the Ides Scientific Institute. In 1972, the Eighth Doctor visited Baker Street. Shortly after the Doctor arrived, a time-space portal opened and Daleks came through, chasing the Doctor, Molly O'Sullivan and Sally Armstrong from the property. (AUDIO: Fugitives) After Kotris was erased from history, the Ides Institute was no longer located in Baker Street.

Following a confrontation with, the Doctor went off alone, leaving Liv Chenka and Molly O'Sullivan to live in the house. (AUDIO: Eyes of the Master) One day while living there, Liv helped the alien Lila to escape from Earth. (AUDIO: The World Beyond the Trees) Later, the Master came to Baker Street and kidnapped Molly. (AUDIO: Eyes of the Master)

In 1980, Romana and the Fourth Doctor stayed in 107 Baker Street once more. (AUDIO: The Movellan Grave)

21st century
In 2008, the Fifth Doctor, Nyssa, and Thomas Brewster visited the house once more, by which time the furniture was falling to pieces and covered in cobwebs. After their stay in London, Brewster decided to stay behind in the city, with the Doctor allowing him to stay in, and maintain, the house as a parting gift. (AUDIO: A Perfect World) He had vacated it by 2011. (AUDIO: The Crimes of Thomas Brewster, The Feast of Axos)