Purchase a North-facing existing home with professionally designed expansion plans totaling approximately 3,150 square feet + about 800 sqft of wk-up basement, which can be customized to suit your needs. You can choose to have your own contractor build it or collaborate with the seller to complete your dream home. This exceptional property presents a rare opportunity to create a luxury multi-level residence without the delays of starting from scratch, as detailed architectural drawings are already in place for a refined transformation that enhances both style and functionality. The proposed design includes 5 bedrooms, 6.5 bathrooms, and a finished wk-up basement, highlighted by a grand kitchen that seamlessly flows into an open-concept room and dining area, maximizing natural light and creating an elegant, inviting atmosphere. The first floor is thoughtfully planned with a 9ft ceiling, a mudroom, a bedroom with a private full bath, a powder room for guests, and an attached garage. The second level features four generously sized bedrooms, each with its own en-suite bathroom, abundant closet space, and a dedicated laundry room. A finished third-floor attic adds approximately 625 square feet of additional living space, while the wk-up basement offers a versatile setting ideal for a private lounge, media room, or entertaining suite, complete with a reinforced safe room for added peace of mind. Structural enhancements, including professional underpinning, ensure long-term stability and support the expanded footprint, and buyers have the flexibility to tailor finishes and design details to reflect their personal vision. Ideally situated in the most desirable section of Iselin, within wkng distance of Oak Tree Road and Metropark Station, and close to major transportation, dining, and shopping, this property offers a unique opportunity to build a truly custom home in a prime, convenient location.