Tucked at the end of a quiet cul-de-sac near Chautauqua Park, 705 Willowbrook is a rare architectural treasure in one of Boulder's most sought-after enclaves. Originally designed by Hobart "Hobie" Wagener in 1957 & expanded in the late 1960s by celebrated architect Tish Papachristou, the home is a stunning example of mid-century vision integrated with its natural surroundings. A bridge over a serene stream leads you to custom double wood doors. The main-level family room makes a dramatic impression with soaring wood-paneled ceilings, tall windows, warm parquet floors & wood-burning stove. The spacious living room features beamed ceilings, floor-to-ceiling windows & another wood-burning fireplace. The adjoining dining room is wrapped in glass, with views of lush greenery all around & connects directly to a classic kitchen defined by walnut cabinetry & vintage tile flooring. Upstairs, the Papachristou-designed addition forms a private & light-filled retreat. A wood-railed landing overlooks the family room below & leads to an office with built-in bookshelves & wood-beamed ceilings. The primary suite features a private balcony, reading nook, window seat & multiple closets. A window framing the first Flatiron offers a daily reminder of the natural beauty just beyond. The lower level offers incredible space for guests, with 3 beds & 2 baths. A large family room with a fireplace creates a secondary living space. Additional features include a 2-car garage, a large studio tucked beneath the primary suite-ideal for creative or functional use-& adjacent storage area. Set on a beautifully landscaped lot, a large wrap-around deck, main-level curved patio with built-in seating & meandering walkways create quiet moments of connection with nature. Close to Boulder's best trails & open space. With just three owners since it was built, this home holds a special draw-rich with architecture, intimate with nature, and ready to embrace the next people who call it home.