Forbes contributors publish independent expert analyses and insights. Mark Faithfull is London-based and covers retail and real estate For the man who would be retail king, these are dark days indeed.

Rehab co-founders on the brand's surge in demand, its new bricks-and-mortar retail debut and how it scaled its supply chain to reflect its sudden growth.

The Vienna-based holding company owns a host of real estate and retail business across the U.S. and Europe, including New York's Chrysler Building as well as department store chains Galeria, KaDeWe ...