Welcome to 400 Rosemarie Drive, an incredible single level fully renovated home with views of the San Gabriel mountains. This is an exceptional like-new residence in the highly coveted E.J. Baldwin's Addition neighborhood of Arcadia. This beautifully reimagined home has been completely rebuilt and renovated-from the new foundation to the updated roof and everything in between-offering a rare opportunity to own a turnkey property that blends modern luxury with timeless design in one of Arcadia's most sought-after neighborhoods. Set on a corner 10,541 square foot cul-de-sac street lot, this modern 4-bedroom + office, 3-bathroom home showcases open-concept living with a seamless flow between the kitchen, dining, and living spaces. The stunning kitchen features a brand-new footprint with quartzite countertops, marble tile backsplash, oversized island, custom soft-close cabinetry, walk-in pantry, and top-of-the-line ZLINE stainless steel appliances. The interior boasts luxury wide-plank vinyl flooring throughout, custom white oak doors, smooth finish drywall, custom railings, an elegant electric fireplace, and thoughtfully designed baths with quartzite counters, designer tile, custom glass showers, and a soaking tub. A breezeway connects the home to the finished 2-car garage, which includes painted walls, finished flooring, and a modern glass garage door with new opener. Additional upgrades include: all new PEX plumbing, new electrical with upgraded main service panel, new HVAC system with ductwork, new tankless water heater, new windows and sliders, fresh exterior paint, new fencing and gates with hardware, and professional landscaping. This home is located within the highly acclaimed Arcadia Unified School District, serving Baldwin Stocker Elementary, First Avenue Middle, and Arcadia High School. As a bonus, this 2500 square foot property comes with approved city plans for a detached 400 sq. ft. ADU (1 bedroom + 1 bathroom)-perfect for future expansion, multi-generational living, or rental income. Move right in and enjoy the perfect blend of timeless design, modern upgrades, and a prime Arcadia location! Owner will build a NEW detached ADU for the buyer per approved plans, ask for details.