The British government acquired the building for use as an embassy in 1945, which had been built in 1917 as the residence of Carlos Madero, in an Edwardian style.

Between 1982 and 1992, following the Falklands War, there were no diplomatic relations between the UK and Argentina.
Switzerland became the protecting power for the UK in Argentina, taking over responsibility not only for the former Embassy but two Consulates-General.

The former British Embassy building remained open, but was known as the British Interests Section of the Swiss Embassy in Buenos Aires and was staffed by Anglo Argentines.
However, a small number of senior British diplomats remained.

The former Argentine Embassy in London came under the Brazilian flag during the same period.

Under the arrangement, the two Interests Sections were unable to have direct communications with their home governments, instead being required to communicate through their embassies of the protecting power, for example, the British Embassy in Berne, Switzerland.

Similarly, until 1989, the diplomats were unable to have direct contacts with their respective foreign ministries, instead having to go through the Swiss and Brazilian embassies.
The British government acquired the building for use as an embassy in 1945, which had been built in 1917 as the residence of Carlos Madero, in an Edwardian style.
Between 1982 and 1992, following the Falklands War, there were no diplomatic relations between the UK and Argentina. Switzerland became the protecting power for the UK in Argentina, taking over responsibility not only for the former Embassy but two Consulates-General. 
The former British Embassy building remained open, but was known as the British Interests Section of the Swiss Embassy in Buenos Aires and was staffed by Anglo Argentines. However, a small number of senior British diplomats remained.
The former Argentine Embassy in London came under the Brazilian flag during the same period.
Under the arrangement, the two Interests Sections were unable to have direct communications with their home governments, instead being required to communicate through their embassies of the protecting power, for example, the British Embassy in Berne, Switzerland.
Similarly, until 1989, the diplomats were unable to have direct contacts with their respective foreign ministries, instead having to go through the Swiss and Brazilian embassies.
Embassy of the United Kingdom, Buenos Aires