Nestled on an oversized, ultra-rare 14,424 sq ft corner shaded by mature trees, and featuring 4 en-suite bedrooms upstairs, 3189 5th St offers timeless style, seamless indoor-outdoor living & coveted location in Boulder's beloved Newlands neighborhood. A covered front porch leads into warm, welcoming interiors filled with natural light, hardwood floors & detailed millwork. A cozy living room with a fireplace opens to a formal dining room-ideal for hosting. At the back of the home, a spacious family room boasts built-in shelving, coffered ceilings & stone fireplace. The adjacent kitchen includes a farmhouse sink, stainless steel appliances, pot filler, 6-burner gas range, generous center island & sunny breakfast nook. The main level is complete with a powder room, laundry room & thoughtfully designed mudroom with limestone flooring & custom lockers. Above the attached two-car garage, a separate wing offers multiple rooms with vaulted wood-beamed ceilings, a bathroom & direct access to the backyard-perfect for guests, an office, or a creative studio. Upstairs, tall ceilings continue throughout 4 en-suite bedrooms connected by a wide hardwood hallway. The expansive primary suite includes hardwood flooring, a private balcony with foothill views & 2 walk-in closets. The primary bathroom features a steam shower, water closet & double vanity. A built-in window bench at the end of the hall adds a charming touch. Outside, the home's stunning outdoor spaces are designed for both relaxation and entertaining. A stone patio includes an outdoor kitchen w/ bar seating, grill, beverage tap, fridge & sink. A retractable awning offers shade, while a fire pit, in-ground hot tub, pergola & tranquil water feature create spaces to gather or unwind. Terraced landscaping, sculptural plantings & grassy lawn complete the serene setting. Located on a quiet, tree-lined street with Mt Sanitas trail access just 2 blocks away, 3189 5th offers the perfect blend of beauty & everyday convenience.