9 Downing Street

Downing Street

Downing Street in London, England has for over two hundred years housed the official residences of two of the most senior British cabinet ministers: the First Lord of the Treasury, an office now synonymous with that of Prime Minister of the United Kingdom, and the Second Lord of the Treasury, an...

is one of the buildings situated on Downing Street

Downing Street

Downing Street in London, England has for over two hundred years housed the official residences of two of the most senior British cabinet ministers: the First Lord of the Treasury, an office now synonymous with that of Prime Minister of the United Kingdom, and the Second Lord of the Treasury, an...

 in the City of Westminster

City of Westminster

The City of Westminster is a London borough occupying much of the central area of London, England, including most of the West End. It is located to the west of and adjoining the ancient City of London, directly to the east of the Royal Borough of Kensington and Chelsea, and its southern boundary...

 in London

London

London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

, England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

.

Under the current government, the building is being used to house the office of the Chief Whip

Chief Whip

The Chief Whip is a political office in some legislatures assigned to an elected member whose task is to administer the whipping system that ensures that members of the party attend and vote as the party leadership desires.-The Whips Office:...

 and is also the Downing Street entrance to the Privy Council Office.

Formerly the building was part of the more famous 10 Downing Street

10 Downing Street

10 Downing Street, colloquially known in the United Kingdom as "Number 10", is the headquarters of Her Majesty's Government and the official residence and office of the First Lord of the Treasury, who is now always the Prime Minister....

, official residence of the First Lord of the Treasury

First Lord of the Treasury

The First Lord of the Treasury is the head of the commission exercising the ancient office of Lord High Treasurer in the United Kingdom, and is now always also the Prime Minister...

, who since the early years of the 19th century has always been the Prime Minister of the United Kingdom

Prime Minister of the United Kingdom

The Prime Minister of the United Kingdom of Great Britain and Northern Ireland is the Head of Her Majesty's Government in the United Kingdom. The Prime Minister and Cabinet are collectively accountable for their policies and actions to the Sovereign, to Parliament, to their political party and...

. Many internal refurbishments over the years have altered the interior of number 10

10 Downing Street

10 Downing Street, colloquially known in the United Kingdom as "Number 10", is the headquarters of Her Majesty's Government and the official residence and office of the First Lord of the Treasury, who is now always the Prime Minister....

, 11

11 Downing Street

11 Downing Street , is the official residence of the Second Lord of the Treasury in Britain, who in modern times has always been the Chancellor of the Exchequer...

 and 12

12 Downing Street

12 Downing Street is the official residence of the Parliamentary Secretary to the Treasury. This is the post held by the Chief Whip of the governing party of the UK Parliament....

 to the point that they are all part of a single complex. It was part of a reorganisation in 2001 that the address was created.

Although number 9 is currently the address of the office of the Chief Whip, the Chief Whip's official residence is still 12 Downing Street

12 Downing Street

12 Downing Street is the official residence of the Parliamentary Secretary to the Treasury. This is the post held by the Chief Whip of the governing party of the UK Parliament....

.