Introducing a remarkable residence on Mt. Sanitas in sought-after Lower Pine Brook Hills! Just 3 1/2 minutes from Broadway, this unique property offers a rare opportunity in an extraordinary location. Set on .51 acres, it provides the very best of mountain living with ease of access to Boulder. This expansive 4,818 sq. ft. home exudes charm and elegance; near the end of a quiet non-thru street adjacent to Open Space and a trailhead, it is a light-filled haven surrounded by incredible beauty. Step through the private courtyard into the inviting entrance with 2-story foyer and glass staircase, highlighting vistas and natural light. Southern exposure bathes common spaces in sunlight, and features views of Flatirons and Sanitas. Stylish design provides space and privacy with 4 bedrooms and 4 baths spread across 4 gentle levels. Elegant raised dining room opens to the living room, boasting vaulted ceilings, fireplace, and 2-story windows, showcasing iconic Boulder vistas. Sunken library/office adds privacy & sophistication. Open kitchen, breakfast nook and family room w/fireplace round out this level. The entire upper level is the primary suite wing, with vaulted ceilings, 5 piece ensuite bath, laundry, large windowed walk-in closet, and private balcony with stunning south/west views. The lower level offers generous flex space, ideal for in-laws, nanny, or guests with separate entry & courtyard, sauna, hot tub, wet bar and fireplace. Other features include high-efficiency boiler and radiant heat throughout. Covered gazebo off the courtyard offers outdoor space for entertaining or solitude. Fire hydrant and enhanced drainage provide safety & peace of mind. This is a rare opportunity to make your home in one of Boulder's most desired neighborhoods. Enjoy luxury mountain living in this extraordinary home and setting!