Set high above Righters Mill Road on a beautiful 1.05-acre lot in the heart of Penn Valley, this 5-bedroom, 3.5-bath classic stone Colonial offers the rare combination of location, scale, privacy, and long-term potential. The setting is the standout: mature trees, a gracious approach, broad lawn areas, a mostly level rear yard, pool, patio, garden areas, detached garage/shed, and a peaceful sense of separation from the street. Built in the 1940s and held by the same family for decades, the home offers more than 4,000 square feet of above-grade living space plus a finished lower level, with a traditional center-hall layout, large formal living room with fireplace, formal dining room, kitchen with breakfast area, expansive rear family room with stone fireplace and built-ins, generous bedroom space, and a large lower-level recreation room. While the home is ready for its next chapter and offers tremendous opportunity for renovation or customization, its classic stone exterior, substantial footprint, central air, forced-air heat, flexible floorplan, and exceptional lot create a compelling foundation. For buyers seeking a substantial Main Line residence on a premier Penn Valley property with privacy, pool, and upside, 727 Righters Mill Road is a rare chance to reimagine a home and setting that are difficult to replicate.