When the United States’ London embassy moves across town from Mayfair to Nine Elms in 2017, it will leave behind a monumental home: the Eero Saarinen–designed Chancery Building, the architect’s only project in the United Kingdom. David Chipperfield Architects’ proposed renovation of the building would transform it into a hotel with retail and event spaces, retaining Saarinen’s patterned Portland stone facade.

Under Chipperfield’s plan—commissioned by Qatar-based developer Qatari Diar—the building’s nine stories (three of which are belowground) would be converted into 137 guest rooms, five restaurants, six flagship retail units, a spa, and a 1,000-person ballroom. The renovation would also strip the property of existing security bollards and barricades, to turn the ground-level area into a welcoming, permeable public space.