**Rare Dual Residence | Cardiff's Coveted Composer District** Where coastal rhythm meets refined living. Discover an extraordinary opportunity- Two impeccably appointed residences on one coveted parcel in the heart of Cardiff-by-the-Sea, where the salt air is soft and the lifestyle is simply unmatched. **The Main Residence** has been meticulously transformed with an elevated coastal aesthetic. Sun-drenched interiors, wide-plank flooring & curated finishes create an effortlessly sophisticated atmosphere. The chef-inspired kitchen; featuring custom cabinetry, premium appliances & generous counter space, flows seamlessly for both laid-back mornings & elevated entertaining.**The 1 BDRM ADU** is a fully independent, turnkey retreat set privately on the oversized lot. With its own kitchen, bath & living areas, this beautifully finished residence invites endless possibilities: a serene guest haven, creative studio, multigenerational sanctuary or high-yield coastal rental. The legendary Composer District offers a walkable, village-soul lifestyle steps from Cardiff and Encinitas beaches, the tranquil San Elijo Lagoon, acclaimed dining, boutique shops, and vibrant weekly farmers' markets. Two beautifully finished homes. One prestigious coastal address. Infinite potential - to live, host, create, or invest. This is North County coastal living at its most refined.  ~Live in Perfect Harmony~A Rare Dual Residence in Cardiff's Coveted Composer District. Tucked within the highly coveted Composer District of Cardiff-by-the-Sea, 421 & 423 Bach Avenue offers a singular opportunity: two impeccably appointed residences on one exceptional parcel: An uncommon configuration that delivers unparalleled flexibility, privacy, and long-term value in one of coastal San Diego's most sought-after enclaves. 421 Bach has been transformed with meticulous care and elevated taste. Bathed in natural light, the interiors unfold in a seamless open-concept design that balances sophisticated elegance with everyday livability. High-end finishes, wide-plank premium flooring, and thoughtfully curated details create a refined yet welcoming atmosphere. The heart of the home is a chef-inspired kitchen featuring custom cabinetry, premium appliances, and expansive counter space; ideal for intimate family mornings or effortless entertaining of friends and clients alike. Set privately on the same oversized lot, 423 Bach Avenue is a fully independent, turnkey Accessory Dwelling Unit (ADU). Complete with its own kitchen, bath, living areas, and thoughtful finishes, this private retreat offers endless possibilities: a luxurious guest suite for visiting family or friends, a serene creative studio or home office, elegant multi-generational living, or a high-yield rental in a coastal market where demand consistently outpaces supply. This is more than a home, it is a lifestyle asset in the heart of North County's premier coastal community. The Composer District is renowned for its walkable, village-like charm and tight-knit character. From your doorstep, enjoy effortless access to top-rated schools, scenic neighborhood parks, and the pristine sands of Cardiff and Encinitas beaches. The vibrant downtown scenes of both Cardiff-by-the-Sea and Encinitas, with their acclaimed restaurants, boutique shopping, weekly farmers' markets, and sophisticated coastal vibe-all just minutes away. Nearby San Elijo Lagoon adds a layer of natural beauty and tranquility that defines this rare stretch of Southern California coastline. In a market where true dual-residence opportunities are exceptionally scarce, 421 & 423 Bach stands apart. Two beautifully finished homes. One prestigious address. Infinite potential for how you choose to live, host, create, or invest. This is coastal San Diego living, refined, connected, and quietly extraordinary.