Welcome to 91 Hancock Avenue - Unit 1, an extraordinary new construction 4-bedroom, 3-bathroom duplex that offers a truly one-of-a-kind living experience in Jersey City Heights. What makes this home unlike anything else on the market is the **private detached carriage house**-a fully independent 1-bedroom, 1-bath residence situated behind the main home. Whether used as a guest house, private home office, in-law suite, gym, creative studio, or income-producing rental, this rare bonus structure provides unmatched versatility and incredible value. Inside the main residence, every detail has been thoughtfully designed with exceptional craftsmanship and luxurious finishes. The bespoke Italian kitchen is a true showpiece, featuring custom LED-lit cabinetry, a paneled Sub-Zero Designer Series refrigerator, black glass Wolf appliances, an oversized Neolith porcelain island imported from Spain with an integrated sink, and a Wolf induction cooktop. A dramatic floating glass staircase with integrated LED lighting creates a stunning architectural centerpiece, while oversized Drutex triple-pane windows flood the home with natural light and provide outstanding energy efficiency and sound insulation. The luxurious primary suite offers a custom walk-in closet with smoked glass doors and integrated lighting, while spa-inspired bathrooms are finished with large-format Neolith porcelain slabs, radiant heated floors, and premium fixtures. Throughout the home, 8-foot American walnut veneer doors, concealed hinges, magnetic latches, and designer brass hardware create a seamless, sophisticated European aesthetic. The detached carriage house is finished to the same exceptional standard as the main residence, offering a beautifully appointed kitchen, full bathroom, spacious bedroom, and complete privacy-making it one of the most unique offerings available in Jersey City. Additional highlights include a 10-Year Builder Warranty, premium construction throughout, and off-site parking options available. This is more than a home-it's an exceptional opportunity to own a luxury residence with the rare advantage of a fully detached second home, all in one of Jersey City Heights' most sought-after neighborhoods.