Architectural legacy meets California tranquility in this AIA-recognized residence by acclaimed architect Donald Olsen. Built in 1967 for his close friend David Ruth, this mid-century modern architecture includes a friendly floorplan with 4 bedrooms and 3 full baths, showcasing Olsen's signature integration of geometry, light, and nature. Built on a secluded knoll-lot of approximately 0.38 acres around a magnificent heritage coastal live oak and perched above a serene creek, the home captures the essence of Berkeley's architectural and natural beauty. Thoughtfully preserved and meticulously improved, the property features walls of glass, original hardwood floors, seismic upgrades, landscape renovations by RDG Landscape Architects including a full native-plant and creek restoration, illuminated walkways, and the exterior patio is embossed with San Francisco cobblestones. A custom O2 Treehouse floats among the oaks, adding playfulness to the refined design. Set in the prestigious Claremont neighborhood, this property offers ADU or multi-generational potential and effortless access to the Claremont Club & Spa, Rockridge BART, and freeway access.