A rare Georgian Colonial estate offering over 12,000 square feet of refined living on 1.5 secluded acres in Castle Pines--where mountain sunsets, privacy, and timeless architecture converge. Tucked away at the end of a cul-de-sac, this exceptional residence offers 8 bedrooms & 9 bathrooms, highlighted by a main-level primary suite and a main level guest suite. The home features soaring ceilings, 3 fireplaces, Brazilian cherry hardwood, classic pillars, brass accents, an open yet elegant floor plan and a walk-out lower level with rare 10'6" ceilings. This custom home offers 6,800 finished sq ft above grade, complimented by an additional 5,000 finished sq ft in the walk-out lower level, featuring an indoor basketball court. Exceptional amenities include an art studio, exercise room, private theatre, wine grotto, two full kitchens, two laundry rooms, and 2 garages providing 4+ parking spaces. Designed for both grandeur and comfort, the main level includes a tranquil primary suite that offers a true retreat experience, complete with spa-like amenities and outdoor access. The gourmet kitchen flows seamlessly into the great room and opens to the deck, creating an ideal setting for outdoor entertaining. The upper level offers 5 generously sized bedrooms with custom walk-in closets and a spacious bonus room. The walk-out lower level is designed for laughter and recreation, featuring multiple living areas and the versatile indoor sports court with its own 3/4 bath! The grounds are equally impressive, featuring mature trees, visiting wildlife, a serene flagstone fire pit retreat, fenced garden area, dog run, and a private orchard with apple, pear, and plum trees--creating a true estate experience rarely found this close to the city. Ideal for buyers seeking privacy, scale, and timeless design--whether for multigenerational living, hosting large gatherings, or simply enjoying Colorado's natural beauty in a refined estate setting. See Private remarks for recent improvements.