Welcome to 279 Haven Avenue, a well-maintained, corner lot and versatile Hi-Ranch ideally situated in the heart of Ronkonkoma within the Connetquot School District. Offering a desirable mother-daughter layout, with proper permits, this home presents a fantastic opportunity for multi-generational living, extended family, or additional living flexibility. The upper level features three spacious bedrooms, hardwood floors throughout, a full bathroom, and a bright, inviting living area. The eat-in kitchen is equipped with granite countertops, stainless steel appliances, and ample cabinet space, making it perfect for everyday living and entertaining. Step outside to the oversized upper-level deck, ideal for outdoor dining, relaxing, and enjoying views of the private backyard. The lower level offers a separate living space complete with one bedroom, a recently updated full bathroom, and additional living areas, creating the perfect mother-daughter setup or income potential. Outside, you'll find a beautifully maintained property featuring mature privacy trees, durable PVC fencing, inground sprinklers, a spacious paver patio, and a four-car driveway providing plenty of parking. Additional updates include a roof that is only two years old, oil-fired baseboard heating, and wall-unit air conditioning. Location is everything, and this home delivers. Just minutes from the thriving Ronkonkoma Hub redevelopment, residents enjoy convenient access to shopping, dining, entertainment, and one of Long Island's most significant transit-oriented developments. Commuters will appreciate the close proximity to the Ronkonkoma Long Island Rail Road station, offering direct service to New York City, while nearby Long Island MacArthur Airport provides exceptional convenience for business and leisure travel alike.