Set on nearly 7 acres in the coveted Mazza Woods enclave of Potomac, this extraordinary estate is a rare architectural offering designed by renowned modernist architect Roy Mason, celebrated for his distinctive use of glass, steel, and sculptural forms that blur the boundary between structure and landscape. Built in 1982 and offered for the first time, this one-of-a-kind residence spans approximately 6700 square feet and stands as a true work of art. A long, private driveway winds through the trees, leading you to this quiet retreat. For those who wish to explore, the property unfolds into acres of forest, with a peaceful creek nestled at the base of the hillside, offering a natural sanctuary just steps from your door. The outdoor setting feels like an expansive private park, magically transforming with the changing seasons. Inside, walls of glass frame panoramic views in every direction, flooding the home with natural light and creating a seamless connection to the lush, private surroundings. Soaring ceilings and an open floor plan on both levels make this an entertainer's dream, while a dramatic three-story staircase leads to a breathtaking observation tower-an architectural centerpiece offering unmatched vantage points over the property. Designed for both grand entertaining and intimate retreat, the home features 4 bedrooms and 3.5 baths, including a serene primary suite with its own sleeping porch-perfect for quiet mornings immersed in nature. The main level offers multiple seating and dining areas adorned with Murano light pendants, while the kitchen is equipped with granite countertops and high-end appliances. The lower level includes two additional bedrooms with a shared bath, plus an ensuite bedroom, and opens to a tranquil Zen garden, creating a peaceful sanctuary. Outdoors, the property transforms into a private resort. A stunning in-ground pool anchors the grounds, surrounded by mature landscaping and specimen trees. The setting is alive with wildlife, including great blue herons, woodpeckers, blue jays, sandpipers, bald eagles, ospreys, and red-tailed hawks. Just a quarter mile from the C&O Canal towpath and the Potomac River, the location is both idyllic and inspiring. Despite its secluded, oasis-like feel, this remarkable property is just minutes from Potomac Village shops and restaurants, with easy access to downtown Washington, D.C. Additional features include steel-frame construction and a two-car attached garage and new roof. A truly special home that is architecturally striking, surrounded by nature, and perfectly suited for a lifestyle of beauty, privacy, and easy, relaxed entertaining.