Welcome to this inviting 2,500 sqft single-family home set on a spacious 9,300 sqft lot in a peaceful Marin County setting. Tucked away at the end of a quiet cul-de-sac in one of Novato's most desirable neighborhoods, the home backs to a lovely hillside with a private backyard retreat complete featuring sparkling pool, gazebo-covered patio, and vistas of rolling hills and surrounding hillside. Upon entry, the living room welcomes you with a cozy fireplace connecting seamlessly into the dining area, ideally positioned next to sliders that open to the backyard for indoor-outdoor living. A well-appointed kitchen enjoys picturesque views of the pool and breathtaking natural landscape. Upstairs, the primary suite includes an en-suite bath, while downstairs offers a fully separate ADU with kitchenette, bed, bath, living area, and private entrance for guests, rental income, or multigenerational living. Enjoy peace and privacy while staying just minutes from downtown Novato's shops, restaurants, and festivities, top-rated schools, and Hwy 101 for a breezy commute to Sonoma and Napa wine country. With great weather, a wonderful community, generous living space, and convenient location, this is a property ready to begin its next chapter, an ideal opportunity to call 21 Sunnyhill home.