Set on a full, level acre with a gated driveway, 1321 Butterfield offers a rare combination of land, privacy, and a functional layout. With 4,007 square feet, five bedrooms, and multiple ensuite spaces, the home is well suited for everyday living, hosting, and long-term flexibility all in one of San Anselmo's most desirable neighborhoods. The main level is designed around connection and usability. The open kitchen anchors the home with stainless steel appliances, counter seating, and direct sightlines to the pool and backyard. The dining room, with vaulted ceilings and doors opening outside, comfortably accommodates both daily meals and larger gatherings. A separate formal living room with built-ins and a fireplace provides a quieter space for reading, movie nights, or unwinding at the end of the day. The primary suite is positioned on the main level and offers a true sense of separation from the rest of the home. It includes a fireplace, extensive built-in storage, two walk-in closets, and an en suite bathroom with a soaking tub. French doors open directly to the deck and lawn, creating easy access to the grounds. Two additional sun-filled en suite bedrooms, a well-appointed laundry room, and flexible upper-level rooms make the layout especially appealing for households that value both space and privacy. A flat acre provides space for recreation, gardening, or animals, while the pool and sport court create a backyard that's usable year-round. Mature landscaping and forested views give the property a sense of privacy without feeling completely remote.