STUNNING!! One of a kind modern masterpiece located in the Knolls area of Simi Valley where its residents find that the rural character of the area enhances the quality of life. There are TWO HOUSES in one lot with separate driveways, utilities and addresses (639 & 617 Katherine RD). The MAIN HOUSE has 2,788 Sq Ft and offers 4 Bedrooms and 4 Bathrooms, a spacious open modern kitchen with plenty of cabinets and high end appliances. Upstairs is the huge private master bedroom that has walking closet corridor and spa like bathroom (separate Jacuzzi and rain shower with steamer), it connects to over a 1,000 Sq Ft balcony that has sweeping mountain views. Include also a convenient central vacuum system. It boasts a luxury and relaxing back patio with custom infinity Jacuzzi, concrete fire place with plenty of sitting space and a BBQ spot. Don't forget the spacious garage that has up to 4 full size cars space, additional storage and systems room. The SECOND HOUSE has 1,224 Sq Ft and offers no less than the main house, it was finished in 2019, has 2 Bedrooms and 2 1/2 Bathrooms, high ceilings, open modern kitchen with stainless steel appliances and a large peninsula. The glass railing balcony has an amazing unobstructed view of the mountains. It also offers a spacious 2 car garage with extra storage/office space. Assessor shows 4 Bed/4 Baths and 2,788 Sq Ft, Information of the second house hasn't been updated yet.