Crowning the Longview building, this spectacular penthouse captures sweeping views of the Charles River, Harvard athletic fields, and the Cambridge skyline from every angle. The heart of this 1,802 SF residence is a magnificent 38-foot living and dining enfilade with SW and NE exposures flooding the space with natural light throughout the day. Two fireplaces anchor the gracious living room and intimate library, adding timeless architectural character. The thoughtful floor plan offers two generous bedrooms in a private wing, plus a flexible third room perfect as an office or guest suite. The kitchen flows into a large walk-in pantry--a rare luxury. With 8'5" ceilings, central A/C, and elegant period detailing, this exceptional residence embodies what architect Louis Kahn described as "the thoughtful making of space... evoking a feeling of quiet joy." Impeccably maintained building, 100% owner-occupied, landscaped garden. Red Line to MIT, MGH, and downtown Boston one block away.