For more than 30 years, George Yabu and Glenn Pushelberg, of the Canadian design firm Yabu Pushelberg, have been making their mark on hotels (Four Seasons Resort Bora Bora, the St. Regis San Francisco), restaurants (Shibuya in Las Vegas, Blue Fin in New York City), and boutiques (Barneys New York and Tiffany & Co., both in New York City). Since 2007, they have been partnering with the furniture company Avenue Road to make their eye-catching furnishings available at retail. Recently, four pieces have been a…