21 E 61St St

The Carlton House is a midcentury Manhattan residence originally completed in 1951 and extensively reimagined during a 2015 conversion. Rising roughly 16 stories, the property contains a small collection of expansive 2-, 3- and 5-bedroom residences including full-floor and multi-room layouts as well as distinctive penthouses and a unique mansion-like townhouse component. Architecturally the façade preserves restored brick and limestone detailing while interiors combine traditional proportions—formal dining rooms, entrance foyers and galleries—with contemporary finishes such as wide-plank hardwood, marble bathrooms and top-tier appliances. Typical apartment features include eat-in and chef’s kitchens, generous closets and walk-in dressing rooms, in-unit washer/dryer capability and smart-home controls in select residences. Shared spaces emphasize a boutique, hotel-quality environment: a marble-clad lobby with full-time doorman and concierge, residents’ lounge and game room, a state-of-the-art fitness center with steam rooms, a 65-foot heated indoor pool and sauna, as well as bicycle and refrigerated grocery storage and optional private storage units. Exterior amenities include balconies, private terraces of varying sizes, a roof deck and a landscaped courtyard; select homes offer large wraparound terraces and private outdoor gardens. The building operates as a condop/co-op hybrid with white-glove staffing, is pet friendly, and is positioned on Madison Avenue just steps from Central Park, immediate access to high-end shopping, dining and cultural institutions, delivering an Upper East Side lifestyle that blends grand apartment scale with full-service conveniences.