Presenting a rare opportunity for a twenty foot wide pre-war townhouse on the Upper East Side. This five-story walk-up sits on an exceptionally quiet and charming street. Located one and a half blocks from Central Park and adjacent to The Park Avenue Armory. Currently built as nine apartments on the second through fifth floors. The ground floor is currently built as a medical office. Zoned for nine apartments and a medical office. Possible conversion to a single-family home. Approved single-family conversion plans include a grand staircase in the foyer, five bedrooms, seven bathrooms, roof deck, and multiple outdoor terraces. Air rights available up to 13,244 SF for a total of 20,084 Buildable SF. A true blank slate to create one's dream home or a fantastic investment opportunity for a developer.