A gracious, turn-of-the-century corner residence offering three spacious bedrooms and a dedicated home office, all within a full-service building in a prime Upper West Side location. Grand in scale and refined in flow, this sun-filled home boasts soaring ten-foot beamed ceilings and nearly seven-foot-tall windows that frame peaceful, tree-lined views. The wood-paneled formal dining room and living room sit side by side, creating a seamless space for entertaining. Currently configured as an expansive double living room, the area feels warm and inviting with custom built-in bookshelves and flexible seating options. At the heart of the home is a beautifully renovated eat-in kitchen, featuring a butler's pantry, marble countertops, stainless steel appliances (including a five-burner stove, dishwasher, and built-in banquette), and a striking patterned hardwood floor that adds texture and charm. Just off the kitchen is a generous home office with custom shelving and a powder room, ideal for working from home or as an overflow guest room.Three well-appointed bedrooms offer generous storage, including a cedar-lined closet and a walk-in hall closet. The serene primary suite enjoys dual exposures, two closets, and a windowed en-suite bathroom.The home also features an in-unit washer/dryer and newly installed top-of-the-line windows. A Sonos sound system is integrated throughout, with speakers in the dining room, living room, and primary bedroom.Built in 1912 by architect Gaetan Ajello, six hundred forty-five West End Avenue is an Upper West Side gem with a grand lobby and full-service amenities including a twenty-four-hour concierge, live-in superintendent, fitness center, private storage, and a landscaped roof deck with Hudson River sunset views. The building is pet-friendly; one block from Riverside Park; close to the express subway; crosstown bus; top dining; cafés; and boutique shopping. A timeless home in a prime location.