Welcome to 12C at 1148 Fifth Avenue, one of JER Carpenter's most iconic buildings. This grand, light-filled 9-room residence features soaring 10-foot ceilings and a coveted classic layout with generously proportioned spaces. The rooms are gracefully arranged around the central entrance foyer, establishing a refined yet straightforward circulation pattern that distinguishes Carpenter's work from that of his peers. Upon entering the 20'x8' central foyer, you are greeted by an elegant gallery that leads to the expansive Living Room, Dining Room, Library, and Kitchen. A semi-private landing enhances the entrance experience, providing an impressive view down the gallery to the Living Room, complete with an original wood-burning fireplace. To the right, enjoy serene views over 96th Street and the lush treetops of Central Park. To the left, original French doors open to the sun-drenched Dining Room, bathed in southern light. The beautifully preserved hardwood floors, doors, and hardware throughout the main living areas add to the residence's timeless charm. The kitchen has been thoughtfully opened into the spacious butler's pantry, creating an exceptional eat-in kitchen with ample storage. Two staff rooms, perfectly suited for home offices, share a full bathroom and retain their original layout and charm. Additional features include a vented washer/dryer and a pantry closet currently designed as a wine cellar. Off the foyer, the bedroom hallway leads to three generously sized bedrooms and two bathrooms. The building has a history of board-approved alterations, allowing for the addition of a fourth bathroom and a powder room in this C-line apartment. There are plentiful closets throughout. The primary bedroom, facing north with partial Central Park views, boasts three walk-in closets and an en-suite bathroom, while the two secondary bedrooms share a large well-appointed bathroom. This residence also includes a large storage unit, bicycle storage, and access to the new, beautifully renovated fitness center. The building is pet-friendly, allows for 50% financing, and encourages central AC. A 2% flip tax applies. 1148 Fifth Avenue is a white-glove building situated in the historic Carnegie Hill district, overlooking Central Park and the 95th Street playground. Residents enjoy full-time doorman service, a dedicated staff, and a live-in resident manager. With the shops and restaurants of Madison Avenue nearby and Mount Sinai Hospital just moments away, as well as proximity to some of the city's finest schools, this property is truly a gem in a prime location.