This 1.01-acre fee-simple residential lot is situated in the prestigious San Marcos Farms community, offering a rare opportunity to build a custom home in one of the most desirable neighborhoods of San Marcos. Located within Twin Oaks Valley, this parcel combines privacy and convenience, with close proximity to major transportation routes such as I-15 and CA-78. The property features a grading plan in advanced stages of approval, retaining wall designs completed, and preliminary house plans in place, streamlining the path to development. The site is within the City of San Marcos municipal limits, nestled among established single-family residences on spacious lots. With no HOA restrictions or fees and a low-density residential zoning designation, the property provides flexibility for creating a large, custom home with generous outdoor space. Surrounded by rolling hills and scenic views, the location offers a tranquil setting while maintaining easy access to local schools, retail, hospitality, and recreational amenities throughout North County San Diego. This parcel benefits from key infrastructure provisions, including partial water approval and paid water meter fees, significantly reducing buyer development risk. It is a compelling opportunity for a developer, builder, or end-user seeking a build-ready residential site in a high-demand area.