Located in one of Gramercy Park's most admired prewar buildings, this three-bedroom, two-bath duplex offers historic charm, a coveted key to the private park, and a house-like layout that feels like a maisonette with 24-hour doorman security. The first floor of this quiet, corner residence features a welcoming entry hall and central staircase, plus an eat-in kitchen, a dining room, and a private living room. Original architectural details include hardwood floors and moldings throughout, adding warmth and character to the home. Upstairs, the primary bedroom includes an ensuite bathroom, alongside two additional bedrooms that share a secondary bathroom. These two bedrooms are ideal for children or as private offices for work-at-home owners. All rooms enjoy high ceilings and large windows. Additional features include an in-unit washer/dryer, generous closet space, and a private storage unit in the building's basement. Built in 1910 by architect Herbert Lucas, One Lexington is a full-service cooperative offering a resident manager, attended elevator, and white-glove service. Ideally situated at the edge of the Flatiron District, residents enjoy nearby access to world-class restaurants, boutique shopping and convenient public transportation that makes it easy to navigate the city. This is a rare opportunity to live on professionally landscaped Gramercy Park, which provides gated, year-round entry to one of New York City's most private and peaceful green spaces.