Bathed in natural light with sprawling outdoor space and protected city views from multiple exposures, this exquisitely renovated penthouse combines unique design pedigree, gracious flow and exceptional craftsmanship throughout.    Originally designed by world-renown architect Robert M Stern in the early part of his career, the residence has just received a platinum-grade gut renovation by Philip Johnson/Alan Ritchie Architects that retains its iconic architectural details while incorporating best in class finishes and modern mechanical systems.    Overlooking the majestic midtown skyline the expansive open-plan living/dining room accommodates entertaining or quiet relaxation, featuring an atrium-style glass enclosure and wood-burning fireplace that lead to the wrap-around terrace and the stunning private roof deck.    The contemporary windowed chef's kitchen, carefully concealed through full-height pivot doors, combines Bulthaup millwork with integrated counter tops and backsplash and Miele & Subzero appliances.    Moving into the bedroom wing, the spacious master suite is enhanced by private terrace access, multiple custom closet systems and a dazzling new en-suite bathroom replete with thoughtful details such as professional quality vanity lighting, heated flooring and towel warmer.    2 additional bedrooms, equally suitable for use as home office or media room, come with their own fully renovated bathrooms with top of the line materials and plumbing fixtures.    Ideally situated within the UES historic district with close proximity to transportation and the city's finest shopping, dining and cultural landmarks, 116 E 66th St is a full-service white glove co-op steps away from Park Avenue, with full-time doormen, elevator operator and live-in super.