Welcome to a gorgeous luxury home in the highly sought after Castlewood neighborhood of Big Sky, Simi Valley. The home is nestled amid majestic landscapes, pristine natural beauty, vast expanses of open space with Whiteface Mountain adding to the peaceful, rural ambiance synonymous with quiet luxury. This home boasts unmatched privacy, located on a short cul-de-sac with no homes on one side of the street, the front of the house looks out to open space with a view into Simi Valley and to the Reagan Library in the distance. The home welcomes you through a beautiful wrought iron gate that opens to a charming courtyard with a fountain. To the left, you'll find a casita and a separate one-car garage. Enter into the home to discover a spacious and well-appointed floor plan, travertine floors throughout the first level with plush carpet on the second level. The expansive living room with its comfortable fireplace opens directly to the courtyard, while the dining room to the right also opens to the courtyard which creates a fabulous space for entertaining, allowing for a seamless flow between indoor and outdoor areas. The kitchen features Granite countertops, a large island, perfect for gathering and cooking, and offers ample storage, including a walk-in pantry, butler's pantry and is equipped with a Thermador built-in refrigerator and Bosch appliances. There is also a breakfast bar and eating area that looks out to a second patio area. The kitchen flows into a huge family room that boasts a fireplace, media niche, surround sound with plenty of large windows allowing natural light and a view to the backyard waterfall. Included on the main floor is a bedroom with a walk-in closet and a private bathroom, laundry room with built-in cabinets and a guest half bathroom. Upstairs, the large primary bedroom suite spans over 1,000 square feet and includes a fireplace, sitting room, private balcony/lanai, expansive walk-in closet and a spa-like bathroom retreat. The primary bath retreat is finished with elegant marble floors, in the shower & counters and includes a large jetted soaking tub, huge shower, dual sinks with plenty of drawers and cabinets. The second level has a beautifully designed loft offering endless possibilities for additional living space - office, upstairs family room or possibly a 5th bedroom. There are two additional bedrooms with ensuite bathrooms, both are spacious with one of the bedrooms featuring a balcony. The upper bedrooms and bonus room look out to the open space and have gorgeous mountain and valley views. The enormous private yard is perfect for entertaining and boasts two patios, beautiful rock waterfall, gas fire pit, spacious grass area and barbeque bar with loads of seating, nearly new built-in barbeque, stainless sink and built-in refrigerator. The Big Sky community offers a wealth of outdoor amenities, including walking and hiking trails, a dog park, softball fields, and breathtaking mountain views. Conveniently located near shopping, dining, and the 118 Freeway, this home is a commuter's dream. Don't miss this rare opportunity to own in one of Simi Valley's most desirable neighborhoods!