Set against sweeping Palomares Canyon views, this private Castro Valley retreat with ADU combines timeless Spanish-style architecture with a beautifully terraced hillside setting. Warm and inviting, the main residence showcases graceful archways, hardwood floors, terracotta tile, and a dramatic covered loggia overlooking the canyon. The thoughtfully designed floor plan features three primary suites + a guest bedroom including a private second-level retreat occupying the entire upper floor. One includes an ADA roll in shower. The eat-in kitchen offers generous counter space and storage, while the well-appointed laundry suite includes cabinetry and a closet for added organization. A spacious formal dining room with a built-in glass-paneled hutch provides an elegant setting for entertaining, while a dedicated workspace nook offers a convenient spot for working from home, hobbies, or crafts. A permitted detached garage with a spacious 1-bedroom, 1-bath ADU above adds valuable flexibility for guests, extended family, a private office, rental income opportunity or additional living space. Bringing the total square footage around 4,386. Outside, the terraced hillside creates a unique connection to the land, with opportunities for gardens, horses, goats, chickens and a barn for hobby farming. Plenty of space for entertaining, and enjoying the peaceful surroundings. Two gated entrances from Palomares Road provide convenient access while maintaining privacy. Recent improvements include new windows throughout residence, fresh interior paint in the main house, and exterior paint on all structures. Come create your own private retreat in the hills and enjoy the beauty of Palomares Canyons expansive views, and a lifestyle connected to the land. From 580 Palomares Rd 7.2 Miles on right or from Niles Canyon Palomares Rd 2.6 Miles on left