Mansion House, London Mansion House, London Mansion House is the official residence of the Lord Mayor of London. It is a Grade I listed building. It is used for some of the City of London's official functions, including two annual white tie dinners. At the Easter banquet, the main speaker is the Foreign Secretary, who then receives a reply from the Dean of the Diplomatic Corps, i.e. the longest-serving ambassador. In early June, it is the turn of the Chancellor of the Exchequer to give his "Mansion House Speech" about the state of the British economy. Mansion House was built between 1739 and
Chancellor of the Exchequer of its interest rates. The chancellor also has oversight of public spending across Government departments. The holder of the office of Chancellor of the Exchequer is "ex officio" Second Lord of the Treasury as a member of the commission exercising the ancient office of Lord High Treasurer. As the Second Lord, his official residence is 11 Downing Street in London, next door to the residence of the First Lord of the Treasury (a title that has for many years been held by the prime minister), who resides in 10 Downing Street. While in the past both houses were private residences,