Discover an exceptional upper floor duplex residence in the iconic Studio Building, a striking limestone cooperative built 1905-06 and designed in the Italian Renaissance style by renowned architect Charles A. Platt. This rare offering retains much of its original architectural integrity, featuring light-filled interiors across two levels with three bedrooms and two-and-a-half baths. A testament to timeless elegance, this Upper East Side home offers the scale and grandeur of a townhome, nestled in one of Manhattan's most prestigious landmarks. Upon entry, a stately foyer laid with Tuscan terracotta tiles leads to the heart of the residence: a magnificent double-height great room with soaring 20-foot coffered ceilings, a late 18th century Neoclassical stone mantelpiece adorning the fireplace, and a sweeping north-facing leaded-glass window. Designed for grand entertaining, this architectural showpiece provides ample space for gracious seating beneath its dramatic ceiling. Adjoining the great room, a sunlit library with a second stone fireplace captures southern views of the Church of St. Vincent Ferrer and Billionaires' Row. Double doors open to a formal dining room, an inviting setting for intimate gatherings. The windowed kitchen, equipped with a service elevator and washer/dryer, offers both charm and functionality. A guest powder room completes the lower level. A sweeping staircase leads to the mezzanine level, where an open balcony overlooks the grand living room below, evoking scenes from the Renaissance. The upper level houses the private quarters, including a primary suite with a spacious bedroom, walk-in closet, and an en-suite bath clad in Calacatta marble. The second bedroom offers en-suite potential, while a third bedroom and full bath complete the upper level. Additional private storage, including a windowed room on the 12th floor and dedicated cellar space, conveys with the apartment. This distinguished cooperative, designated as a NYC landmark and listed on the National Register of Historic Places, has long been home to some of the city's most illustrious residents. With 24-hour staff, an attended elevator, and a live-in resident manager, The Studio Building at 131 East 66th Street delivers an unrivaled Upper East Side lifestyle, close to world-class retail, dining, cultural institutions, and Central Park. The co-op allows 50% financing, is pet-friendly, and permits pied--terre ownership. A 3% co-op transfer fee is payable by the purchaser.