Introducing 502 Highland, a reimagined five-bedroom, five-bathroom showplace situated on a rare triple lot on Boulder's most desirable street. With unrivaled quality, smart home innovation and designer style, this Mapleton residence is a once-in-a-lifetime property. Rebuilt from the ground up by Coburn Design, this stunning home embodies the Boulder lifestyle with sun-splashed living spaces, a seamless indoor-outdoor layout and exquisite finishes. Ceilings soar above white oak and Carrara marble floors, while board-and-batten paneling and custom millwork create a sophisticated ambiance. Double-hung Marvin windows are trimmed with Hunter Douglas wood blinds, while solid doors boast custom wood screens. An elegant wraparound porch and gracious foyer introduce a thoughtful layout ideal for lavish entertaining and comfortable daily life. Relax alongside the living room's wood-burning stove and plan your next dinner party under coffered ceilings in the formal dining room. The gourmet kitchen impresses with floor-to-ceiling custom cabinetry, swaths of marble, state-of-the-art appliances, a wet bar and a massive center island. The expansive family room opens to brick patios overlooking the exquisite irrigated, landscaped and fully fenced rear yard. A chic powder room and large home office complement the living areas. Luxurious accommodations begin with the main-floor owner's suite, a serene sanctuary featuring direct patio access, a spa-inspired en suite marble bathroom, and a massive custom closet. Ascend the focal-point staircase to find four equally well-appointed secondary bedrooms, including two suites, and a large deck with phenomenal views. The lower level provides space for a media lounge, playroom or home gym alongside wine rooms and a laundry room. Enjoy plenty of parking in the three-bay detached garage with EV charging and an office/studio. Extensive upgrades and innovative smart home features throughout. Magnificent Mapleton Hill Historic District location.