A Mid-Century Masterpiece, Rarely offered and highly sought after. 31 Auchmar Road is an architectural treasure on one of Hamilton's most desirable streets. Designed in 1963 by acclaimed Harvard architect Joseph Bogdan, The Ranalli House stands as a distinguished example of mid-century modern design while recognized and award-winning, with timeless character that has only grown more captivating with age. From the striking façade with clerestory and vertical embrasure windows to the seamless indoor-outdoor connection, every element of this home reflects sculptural precision and modernist elegance. The interior showcases original polished stone floors from Germany, soaring 106 ceilings, and a dramatic floating staircase framed by exposed brick and stained-glass accents. The flowing main floor plan connects formal and casual living spaces, complemented by two gas fireplaces and a custom kitchen with Sub Zero appliances. Offering nearly 4,000 sq. ft. of living space, the home features 6 bedrooms and 4 bathrooms, including a main-floor primary retreat with spa-inspired ensuite and walk-in closets. Upstairs, the flexible layout allows for office or secondary living space alongside family bedrooms and a convenient second-floor laundry. The backyard is a private modern oasis, designed for both relaxation and entertaining. A heated concrete pool with diving board and waterfall feature anchors the landscaped gardens, while an oversized pergola with built-in Wolf BBQ and serving station creates the perfect outdoor dining pavilion. Granite patios, stone decking, and thoughtful lighting extend the lifestyle well into the evening. Additional highlights include a finished lower level with gym/recreation area, an upgraded roof system, and a double car garage with epoxy floors and showcase lighting.