In the end, this show isn’t about possessions but about absence and loss. The photographer Iwan Baan recently returned to the former Ephrussi headquarters and shot their current state. In Paris, an aesthete’s Eden is now a den of generic white offices; the aristocracy of taste and money has given way to the democratising forces of bureaucracy.In Vienna, Baan finds a more intact relic, a maze of empty marble chambers wreathed in gilt. For 40 years, the palais housed the offices of Casinos Austria. In Baan’s photos, it lies vacant, a stone sarcophagus with a Starbucks on the ground floor.