Some designs simply endure. Built in 1966, this mid-century modern split-level is a wonderful example - thoughtfully laid out, filled with natural light, and designed with a sense of flow and function that feels just as relevant today. The main living level brings the kitchen, dining, and living spaces together beneath an open-concept layout, with oak floors adding warmth throughout. A bay window draws your eye toward water views, while a propane fireplace anchors the living room. The kitchen pairs quartz countertops with Bosch appliances, and practical details - including a pantry, coat closet, formal front entry, and direct garage entry with its own landing - make everyday living easy. Perhaps the home's most inviting space is the tiled sunroom. Insulated and built on a foundation, with Andersen sliding doors on three sides, it feels wonderfully connected to the outdoors and provides an exceptional place to relax throughout the seasons. Three bedrooms and two baths are arranged within 1,790 square feet of upper-level living space, while an additional 450-square-foot finished den/library in the basement offers a cozy retreat, office, or flexible bonus space. An attached two-car garage completes the property. With its south-facing orientation, the home enjoys excellent natural light and glimpses of the sun reflecting across Penobscot Bay. Set along dead-end Seaside Drive, the setting feels removed without being remote - downtown Belfast, the waterfront, co-op, hospital, and everyday amenities are all approximately five minutes away. Also offered with this property is interest in Map 29, Lot 21, a vacant lot diagonally across the street. Included in the purchase of the home is 1/3 undivided interest in an empty parcel across the street ( Map 29, Lot 21, 17 Seaside Dr.) that protects against future development on this lot in order to preserve views from the property.