10 Downing Street

10 Downing Street in London is the official residence and office of the prime minister of the United Kingdom, as the First Lord of the Treasury. Colloquially known as Number 10, the building is located in Downing Street, off Whitehall in the City of Westminster.

It is over 300 years old, is a Grade I listed building, and contains approximately 100 rooms. A private residence for the prime minister occupies the third floor and there is a kitchen in the basement. The other floors contain offices and conference, reception, sitting and dining rooms where the prime minister works, and where government ministers, national leaders, and foreign dignitaries are met and hosted. At the rear is an interior courtyard and a terrace overlooking a 1⁄2-acre (0.2 ha) garden. Number 10 is adjacent to St James's Park, approximately 3⁄4 mile (1.2 km) from Buckingham Palace, the official residence of the British monarch in London, and is near the Palace of Westminster, the meeting place of both Houses of Parliament.