10 Downing Street located on Downing Street in Westminster, London adjacent to St. James’s Park. Close to Westminster Palace. Parliament House and Buckingham Palace It is the residence of the Queen and other royal families. And the place is famous both in the UK itself and in the world. The building is 300 years old. Formerly the abode and official residence of the 1st Lord of the United Kingdom. And the government headquarters in the Queen. It is also the residence of the Prime Minister of the United Kingdom. He is now considered Lord of the throne.