IT’S A MYSTERY HOW A CITY LIKE LAS Vegas, which has its own massive replicas of the Eiffel Tower, the Rialto Bridge, and the Trevi Fountain, could take so long to lure in hoteliers with a refined (more César Ritz, less Joe Pesci) take on luxury. Enter the Sydell Group, which recently debuted the 293-room NoMad Las Vegas hotel there. As at its sister properties in Manhattan and Los Angeles, the hotel’s interiors, by French designer Jacques Garcia, bring velvety grandeur to Glitter Gulch. “NoMad has always been at the intersection of old-world style and service, with a modern sensibility and fun,” says Andrew Zobler, CEO of the Sydell Group. With a restaurant helmed by Daniel Humm of Eleven Madison Park and a new pool whose cobalt color scheme is…