Set on an expansive ~0.45-acre (~19,595 sq. ft.) lot along a quiet, tree-lined street in prime North Los Altos, 90 Marvin Avenue offers a rare blend of scale, privacy, and modern efficiency just steps from Downtown. Framed by mature trees and lush grounds, the single-story main residence features three ground-floor bedrooms, two-and-a-half baths, a home office, and a soaring great room with vaulted beam ceilings. A chefs kitchen with custom cabinetry and granite slab countertops flows seamlessly to custom brick patios, a micro-vineyard, and a detached guest house (~428 sq. ft.) with vaulted ceilings and a full bath ideal for guests, an au pair, or an executive office. Upgraded for low-maintenance comfort and sustainability, the property features two brand-new heat pump HVAC systems, two brand-new electric water heaters, copper plumbing to the house and street, a 200-amp electrical service, and a rich history of fully permitted renovations. Situated near top-rated schools, fine dining, and tech hubs, this home offers an unmatched Silicon Valley lifestyle.