The facade of the US Embassy building in Grosvenor Status has been given listed building status by the government minister responsible for architecture.
The controversial building, which often divides opinion, has been cited as an important piece of modernist architecture by Margaret Hodge.
The Embassy was built between 1955 and 1957 and designed by Eero Saarinen. Last year, it was announced that the Embassy was looking to move to a new site at Nine Elms and would sell the building. Any new buyer will now be forced to maintain the existing facade may dampen price expectations for the gargantuan compound.