Lloyd and Barbara Macklowe opened their doors in 1971 and Macklowe Gallery, now co-run by their son Benjamin Macklowe, is currently the longest-running family-owned business on Madison Avenue. Since then, they've become the global leader in lamps and glassware from Louis Comfort Tiffany, selling over 1,500 lamps, including many individual Tiffany lamps valued at over $1 million, as well as many priceless exemplars now in museum collections. Macklowe Gallery is also an unsurpassed dealer in French Art Nouveau furniture and objets d'art, French cameo glass by Argy-Rousseau, Daum and Galle, and lithographs by Alphonse Mucha. Open Mon.-Fri., 10:30am-6pm, and Sat., 11am-5pm.