Julian Niccolini, left, and Alex von Bidder at the new Four Seasons in New York. 

The day Lehman Brothers filed for bankruptcy — Sept. 15, 2008 — the Grill Room was practically empty. Julian Niccolini, the maitre d'hôtel and a co-owner of the Four Seasons restaurant, was taking calls nonstop. The calls came from Wall Street executive assistants, canceling the reservations of the so-called Masters of the Universe who had suddenly become the Masters of Nothing.

The cancellations piled up, and those who kept their reservations tempered their spending. "Lots of iced tea," Mr. Niccolini said, "and very little wine sales."