Welcome to 125 Mansion Avenue, an incredible waterfront residence offering flexible living space, multiple outdoor areas, and direct access to the lifestyle that makes Great Kills Harbor so desirable. This home features hardwood flooring upstairs, wood look tile on the ground level, baseboard heat, central air, additional window A/C units, and an electric fireplace for added comfort. The main living areas open to a deck overlooking the marina, while the primary bedroom includes its own private terrace, creating multiple places to enjoy the water views. The upper level offers a spacious primary suite with a private bathroom featuring a stand up shower, additional bedrooms, and a washer / dryer conveniently located on the top floor. The walk in ground level adds valuable flexibility with an additional bedroom, full bathroom, private entrance, garage access, and side entrance, making it ideal for guests, extended family, or a home office. Additional highlights include a new roof completed in 2025, built in garage, 4 bathrooms throughout the home, and a location directly by the marina where boating, fishing, and waterfront living are part of everyday life. Just moments from Marina Cafe, Cole's Dock Side, and other popular local restaurants, 125 Mansion Avenue offers the rare combination of space, versatility, and a true waterfront setting. Whether you're relaxing on the balcony, entertaining on the deck, or heading out on the water, this home delivers a unique Staten Island coastal lifestyle.