Manhattan's Upper East Side has no shortage of buildings with a wow factor. The chic area — home to world-class eateries, the Museum Mile, and many designer boutiques — features some of the most coveted real estate listings in New York City. Development in the area started in the late 1860s when rows of brownstones began popping up. A couple of decades later, many of the facades were updated to reflect the popular Renaissance revival style. Now, you can own the most photographed townhouse in the neighborhood. Located at 163 East 64th Street, the 20-foot wide, 90-foot deep Neo-Georgian townhouse has a gorgeous limestone and red clay brick facade. The home spans 8,000 square feet over four stories but has an additional 1,325 square feet of air rights, which means that the new owner could add a fifth floor and a private rooftop deck. The townhouse dates back to 1872, when owner John G. Prague installed soaring ceilings, wainscotting, and original details that ooze Old World grandeur. With its 5-bedroom suites, five full baths, and three powder rooms, the house is perfect for a family. A private elevator takes you from the ground floor, where the gourmet kitchen and patio are located, to the top floor, where you can enjoy the city in the privacy of your European-style rooftop garden. The property's other standout features are an original English pine library dating back to 1872, a bar, a wine room, and a private gym. The picture-perfect townhouse stands on a quiet, tree-lined street, and if you’re interested, all you have to come up with is a cool $19.5 million.