Rare opportunity to own a picture perfect, well-built, mint legal two-family home in the heart of Mamaroneck's sought-after Rye Neck with an enormous level backyard! Offering exceptional flexibility, this property is ideal for owner-occupants, multi-generational living, or investors seeking strong rental income potential. The main residence features an oversized living room that flows into a spacious eat-in kitchen, which opens directly to a large covered porch - perfect for effortless indoor-outdoor entertaining. The porch overlooks the expansive flat backyard, which offers endless possibilities for gardening, recreation, outdoor dining, or even a future pool. The main level also includes three well-appointed bedrooms with ample closet space and a full hall bath. The lower level provides additional living space with a large recreation room, laundry area, and a second full bath. The second-floor apartment is bright and inviting, featuring two bedrooms, a full bath, an eat-in kitchen and a sun-filled living room. Perfectly situated on a quiet residential street just moments from everything Mamaroneck has to offer, residents enjoy easy access to Harbor Island Park, local beaches, vibrant restaurants, shops, and waterfront recreation. Commuters will appreciate the close proximity to the Mamaroneck Metro-North station, providing express service to Grand Central Terminal in under 40 minutes. The property is also conveniently located near Rye Neck schools, making it an attractive option . Whether you're looking to offset your mortgage with rental income, create space for extended family, or add a valuable asset to your investment portfolio, 419 Beach Avenue offers a unique combination of versatility, location, and long-term potential in one of Westchester County's most desirable communities.