Still Available to be shown. Home sale contingency, This is the dream....an architectural masterpiece reminiscent of an English Country Manor, offering timeless sophistication, unmatched privacy, and a premier location. The exceptional craftsmanship and impeccable finishes elevate this residence well above the ordinary. Tucked at the end of a quiet cul-de-sac and secured behind stately gates, this private oasis is sited on a lush and manicured 3.61-acre parcel (combined lots 5&6 or 688 &684 Rossmore). A sweeping crescent-shaped cobblestone drive, slate roof, and elegant four-car side-entry garage set the stage for an unforgettable arrival. Crafted by renowned Great Falls Construction, this one owner home is a masterclass in thoughtful design and quality. From the soaring foyer with marble and mosaic inlays, custom lighting, and graceful curved staircase, to the richly detailed formal living and dining rooms, each with fireplace and exquisite millwork, youll sense immediately that no expense was spared. At the heart of the home, the Family Room rises to 20+ feet with floor-to-ceiling windows, a magnificent stone fireplace, and a full wet bar with custom cabinetry, designed for both grand-scale entertaining and relaxed evenings at home. The newly remodeled chefs kitchen (2025) is timeless in its elegance: crisp white cabinetry, quartz countertops, a walk-in pantry, commercial-grade stainless appliances, and generous seating options for casual or formal meals. The adjoining sun-drenched glass conservatory is the perfect place to unwind with panoramic views of rolling lawn and a neighboring equestrian estate. Step out to the tiered stone terraces, ideal for outdoor entertaining, with a graceful iron staircase connecting to the lower-level patio and screened porch. Framed by lush lawn and stately trees, the grounds provide a sweeping and versatile canvas, inviting you to bring your own vision of leisure, beauty, and recreation to life. One of the most desirable features is the main-level primary suite, a true sanctuary with magnificent ceiling, sitting area with fireplace, and three custom closets. The spa-inspired primary bath includes a walk-in shower, dual vanities plus dedicated makeup vanity, and a luxurious Japanese soaking tub. Adjacent, is an opulent study/library, masterfully crafted in rich mahogany, featuring a warm fireplace and custom built-insa space that offers an ambiance that words can scarcely capture. The main level also features two powder rooms, a spacious laundry/mudroom with exterior access, a discreet rear staircase, and a paneled elevator offering access to all three levels. The bright, expansive walk-out lower level offers a world of possibilities. Highlights include a spacious rec room with fireplace and built-ins, a pub-style game room with wet bar, a large flexible-use space with an island ideal for crafting, homework, or home office, and several additional rooms to accommodate a gym, workshop, studio or living spaces. Theres also a full bathroom and three sizable storage/utility rooms. Upstairs, a dramatic gallery gazes over the Family Room and grounds beyond. Three generously sized bedrooms feature ensuite baths, large closets, and rich hardwood floors. A fourth, exceptionally large suite includes a brand-new kitchenette and bath (2025), along with a bonus room/study, perfect for multi-generational living, or a nanny. Additionally, there is a walk-in cedar closet. The estate is fenced on three sides and is clearly staked for boundary clarity on the fourth side. All of this is located within the highly acclaimed Langley School Pyramid, and just minutes to the cultural and professional hubs of Washington, D.C., Tysons Corner, Reston Town Center, Dulles International Airport, top-tier hospitals, Great Falls Park, the Dulles Tech Corridor, churches, and the charming village center of Great Falls. This is more than a home, its a lifestyle of elegance, comfort, and desirability.