INVESTOR ALERT! TENANT IN PLACE! The Chatham, built by renowned architect Robert A.M. Stern, is one of the Upper East Side's most distinguished white glove buildings, personifying elegance and charm of a bygone era with contemporary living in mind. Airy and light living space and 3 bedrooms plus den/fourth bedroom and 3 baths, Apt 5A exudes luxury from the second you enter its 26-foot-long gall...