Positioned on a rare double lot in the heart of Seal Beach, 308 13th Street is a beautifully remodeled duplex offering charm, functionality, and strong investment potential. Each of the two residences has been extensively upgraded with new flooring, stainless steel appliances, HVAC systems, water heaters, and fresh interior/exterior paint. The bedrooms, bathrooms, and kitchens in both homes have been fully remodeled with modern finishes and contemporary design. The front home is a charming single-story beach cottage offering 3 bedrooms, 2 bathrooms, and a welcoming front porch overlooking the yard and friendly neighborhood streetscape. The rear home spans three stories, boasting a spacious open-concept layout, 3 bedrooms, 2 bathrooms, a cozy living room fireplace, and a rooftop deck with sweeping ocean and neighborhood views. Each residence includes its own private 2-car garage, providing secure parking and generous storage. Currently tenant-occupied, the property generates $12,350/month in rental income, reflecting an estimated 5.3% cap rate. Leases with approximately one year remaining will transfer with the sale, offering a seamless transition for investors. Also included are plans for two detached 2,508 sq.ft. single-family homes, presenting an opportunity for future development. Whether you're exploring a 1031 exchange, seeking to live in one unit while renting the other, or pursuing a turnkey investment, 308 13th Street delivers unmatched versatility in one of Seal Beach's most coveted neighborhoods.