“The building is listed on a historic register, both inside and out, which means it’s especially difficult to run,” says Claus, ruminating on why the Association Auguste Perret agreed to let him rent Perret’s apartment. “In many ways, I think it was an answer to their prayers: income from someone who understood the space and in no way wanted to tamper with it.” 

A framed vintage Michelin map of France—“the same one my parents used to drive us around,” says Claus—leans against the oak-paneled wall in the bedroom, alongside an AJ floor lamp by Arne Jacobsen and a lacquered metal Fronzoni 64 bed by A.G. Fronzoni.  Bedrooms by Dwell from Modern High-Design Pied-à-Terre in Paris