Welcome to 31 Neptune Avenue, Mastic, NY Don’t miss this expanded and updated Cape with room for everyone! Set on a beautifully manicured quarter acre lot, this 4-bedroom, 4-bathroom home offers the perfect blend of character, function, and versatility ideal for extended living or multi-generational needs. Step inside to gleaming hardwood floors (recently refinished), elegant crown molding throughout, and a thoughtfully designed floor plan featuring a spacious Den, formal dining area, eat-in kitchen with stainless steel refrigerator, and electric cooktop with in-wall oven. A cozy Living Room with a wood-burning fireplace, separate family room, and mudroom add plenty of flexibility for everyday living. The first-floor full bath has been fully renovated, and Andersen windows provide quality and efficiency throughout. Two spacious bedrooms are located on the main level, with two more upstairs each floor offering its own bathrooms, including two full baths upstairs and private second-floor entrance via rear deck, perfect for guests or extended family. A second Living room is located on the 2nd floor along with a Den. Step outside to your personal oasis a stunning 18x39 in-ground pool with diving board, solar cover, and a pool house complete with two sliding doors, wet bar, full bath, and ample storage. The fully fenced backyard features mature landscaping, under-soffit lighting, and a circular driveway, offering both curb appeal and functionality. Additionally the home includes a 5 Zone In-ground sprinkler system, Ring cameras and an alarm system. New Window Blinds, Door Knobs/ handles throughout the home. A very spacious full basement with outside entrance, Laundry room and storage galore. Property has above ground oil tank. Kitchen has an under sink reverse osmosis filtration system. This Unique home has been lovingly maintained and offers flexible living options for a variety of lifestyles. Home is being sold ASIS