Welcome to retreat-style living at 21 Colorados, a well-loved home cherished by the same family for nearly 60yrs. Set on an expansive ~0.4-acre lot-one of the largest in Millbrae Hills-this property is peacefully surrounded by nature, offering a rare sense of privacy & tranquility.  Formal living room w a cozy fp upon entry, next to formal dining room. Kitchen has a breakfast nook, & opens to side yard, perfect for entertaining!  The spacious primary suite offers a walk-in closet and a full bath. Two spacious bedrooms share a full bath. All three bds face peaceful backyard, creating a naturally restful atmosphere.  Lower level features a large family room with sliding glass doors that open to the large level backyard, along with a full bathroom, direct access to side yard, ideal for multi-generational living or potential rental income. A generous flex room currently used as a laundry room, also provides tons of room for creation.  Additional highlights include: humongous attic and basement storage; a side-by-side two-car garage; a generous, private lot w its own hiking trails...  Conveniently located near top-rated schools, parks, and golf courses, with easy access to SFO, BART, shopping centers, and nearby major tech companies, this home has so much to offer.