who lives next door to the prime minister
Downing Street For more than three hundred years it has held the official residences of the First Lord of the Treasury, an office now synonymous with that of Prime Minister, and the Second Lord of the Treasury, an office held by the Chancellor of the Exchequer. The Prime Minister's official residence is 10 Downing Street; the Chancellor's official residence is next door at Number 11. The government's Chief Whip has an official residence at Number 12, although the current Chief Whip's residence is at Number 9.