Welcome to 1648 Topanga, one of the largest homes in Costa Mesa's desirable 17 West community. Offering 2,142 sq ft across four thoughtfully designed levels, this contemporary residence offers four bedrooms, three full bathrooms, two half bathrooms, three outdoor spaces, an attached two-car garage, and a private rooftop terrace with views toward Fashion Island and Saddleback Mountain, plus peekaboo ocean views on clear days. The entry level includes a private en suite bedroom, front patio, direct garage access, and extensive California Closets built-ins, ideal as a guest suite or home office. The main level opens to soaring ceilings, generous living and dining areas, a private balcony, and an upgraded kitchen with a breakfast bar, built-in appliances, extensive cabinetry, and two pantries, including one oversized. Abundant natural light and refreshing ocean breezes create the relaxed coastal living experience that makes this home so special. The third level includes the primary suite with a spacious oversized closet and California Closets built-ins, dual-sink vanity, and large shower. Two additional bedrooms, another full bathroom, and a conveniently located laundry area complete the level. At the top of the home, an expansive flex room provides exceptional versatility as a media room, gym, office, playroom, or creative studio and opens directly to the private rooftop terrace, an ideal setting for outdoor dining, sunset gatherings, and relaxing beneath the Southern California sky. Additional highlights include dual-zone HVAC, tankless water heating, low-E dual-pane windows, LED lighting, ceiling fans, and smart home technology. Community amenities include barbecue and picnic areas, fire pits, a bocce ball court, playground, and pet-friendly spaces. Located directly across from Trader Joe's and minutes from Newport Beach, Lido Marina Village, Newport Harbor, Hoag Hospital, the Back Bay, and the restaurants and boutiques of 17th Street, 1648 Topanga offers an exceptional combination of coastal living, flexible space, modern convenience, and location.