Mallowan, the Soviet NKVD spy master Arnold Deutsch who recruited the Cambridge Five, the German born economist and Soviet spy Jürgen Kuczynski, the author Nicholas Monsarrat, ethnomusicologist Erich Moritz von Hornbostel, architect Jacques Groag and his wife, textile designer Jacqueline Groag, architects Egon Riss and Arthur Korn and the author Adrian Stokes. The British architects Sir James Stirling and Alec Bright, later director of the Museo del Oro in Bogotá, Colombia were resident during the 1960s. Regulars at the Isobar included the sculptors Henry Moore, Barbara Hepworth and Naum Gabo and the painter Ben Nicholson as well as Sir Julian Huxley. Pritchard remained in London during World War II while Molly Pritchard and their children Jonathan and Jeremy left for the United States where she moved in with Walter Gropius and his wife Ise, while the children attended a boarding school in Canada. The building was popular as a residence during the war due to being made out of reinforced concrete, and despite near bombs, survived the Blitz. It was repainted brown during the war as it was feared its white surface could serve as a guide for German bombers. In 1955, Pritchard staged a 21st birthday party for the building on its roof top terrace. Philip Harben returned to make the food, architectural writer Nikolaus Pevsner made a speech and letters from Walter Gropius and Marcel Breuer were read out. Wells Coates and many pre-World War II residents attended the event, as well as designers Robin Day and Lucienne Day and architects Alison and Peter Smithson. The building was sold by Pritchard in 1969 to the magazine New Statesman, who demolished the Isobar and made it into flats. They then sold the building on to Camden Council in 1972 for twice the price. The building was listed Grade II in 1974 by English Heritage and listed Grade I in 1999. Despite this, it received very poor maintenance from Camden Council and deteriorated badly. During this period it was partly used to house single men with drug, alcohol and mental health problems. After a long campaign to save the building, it was sold to the housing association Notting Hill Housing Group in 2003, in a joint bid with the modernist building conservation firm Avanti Architects, headed up by architect John Allan, with the pledge that a museum would open in the building. It now contains 36 flats, most that are