Nestled on a picturesque, tree-lined street in the highly sought-after Caltech, Polytech, and Huntington Library neighborhood, this traditional Colonial-style home has been thoughtfully expanded and renovated (2025-2026) with modern upgrades and sleek finishes. Behind the hedges and gated driveway lies a two-story sanctuary spanning 3,985 sq. ft. of living space. The home offers four bedrooms, four and a half baths, and a versatile, connected JADU complete with its own kitchen, bathroom, and private entrance.The spacious, light-filled, open-concept layout seamlessly connects the living, dining, family room, and kitchen areas to a covered patio and pool/spa area--perfect for indoor-outdoor comfort living, and entertaining. At the heart of the home is a gourmet chef's kitchen featuring European-style oak custom cabinetry, a marble-look quartz waterfall island, Thermador stainless steel appliances, and a dedicated secondary wok kitchen. The interiors are accented by wide-plank oak flooring, designer light fixtures, custom window coverings, and high-end finishes throughout. An en-suite bedroom, powder room, and laundry room complete the main floor.Upstairs, you will find three bedrooms, three bathrooms, and a cozy sitting area. The luxurious primary suite features a private balcony overlooking the backyard, a walk-in closet, and a spa-inspired en-suite bath with dual vanities, a soaking tub, and a walk-in shower. The two additional upstairs bedrooms each feature a walk-in closet and a private en-suite bath. For added convenience, a second laundry room is located on this level. The connected JADU can easily serve as a fifth bedroom, guest suite, home office, or income-generating rental.Step outside to the tranquil backyard, where a covered patio, a sparkling pool and spa, a built-in BBQ station, and multiple seating areas provide a perfect setting for entertaining and relaxation.This extensive renovation offers total peace of mind. Key features include new electrical panels, recessed LED lighting, a 220V EV charging plug, two energy-efficient HVAC units, copper plumbing, two tankless water heaters, whole-house water filtration, pre-wired speakers, data-wiring, video surveillance, and energy-efficient windows/doors. Additional upgrades: brand-new roof, new kitchen/baths, new interior cabinetry, new sprinkler system, and new gate motor. A turnkey residence in one of Pasadena's most coveted locations.