Designs for the flats were developed between 1929–1932 and the complex opened on 9 July 1934 as an experiment in minimalist urban living. All of the "Existenzminimum" flats had very small kitchens as there was a communal kitchen for the preparation of meals, connected to the residential floors via a
dumbwaiter. Services, including laundry and shoe-polishing, were provided on site. The building originally included 24 studio flats, eight one-bedroom flats, staff quarters, a kitchen and a large garage. The Pritchards lived in a one-bedroom penthouse flat at the top with their two sons Jeremy and Jonathan next door in a studio flat. Plywood was used extensively in the fittings of the apartments; Jack Pritchard was marketing manager for the
Estonian plywood company Venesta between 1926 and 1936, while he also operated the Isokon Furniture Company, originally in partnership with
Wells Coates. Celebrated residents included:
Bauhaus émigrés
Walter Gropius,
Marcel Breuer, and
László Moholy-Nagy; architects
Egon Riss and
Arthur Korn; writer
Agatha Christie (between 1941 and 1947) and her husband
Max Mallowan, art historian
Adrian Stokes, the author
Nicholas Monsarrat, the archaeologist
V. Gordon Childe, modernist architect
Jacques Groag and his wife, textile designer
Jacqueline Groag. The communal kitchen was converted into the Isobar restaurant in 1937, to a design by Marcel Breuer and F. R. S. Yorke. The flats and particularly the Isobar became renowned as a centre for socialist intellectual and artistic life in Hampstead. Regular visitors to the Isobar included nearby residents
Henry Moore,
Barbara Hepworth and
Ben Nicholson. ==Espionage==