Classy, chic and comfortable—these are the words that are often used when describing the Upper East Side neighborhood of New York City. And now, here’s another adjective to throw into the mix: cool. At first, this may be a little hard to comprehend; after all, this Manhattan neighborhood has long had a reputation of being rather pricey, thereby keeping hip (but cheap) New Yorkers at bay. With its beautiful pre-war buildings that are located blocks away from Central Park, apartments on the Upper East Side have always been in high demand and, therefore, have been mostly out of reach for the “cool crowd.” But, of late, the homes here have suddenly become affordable, and the reason for that is, interestingly enough, coming from underground—the Second Avenue Subway construction.