Nestled on one of Santa Monica's most coveted tree-lined streets in the prestigious North of Montana neighborhood, 415 21st Street is a timeless English-inspired residence. This expansive 5-bedroom, 6.5-bath home offers approximately 5,100 square feet of living space with an incredibly functional floor plan and exceptional flexibility for today's lifestyle.The first floor is designed for both comfortable daily living and entertaining, featuring two generous living spaces that can easily adapt to a variety of needs. Whether envisioned as formal living and dining rooms, a media or recreation room, playroom, home office, or a combination of uses, the layout offers remarkable versatility. At the heart of the home, the kitchen opens directly to the family room, creating a natural gathering space that connects seamlessly to the surrounding living areas. A laundry room, powder bath, and a first-floor bedroom with its own bathroom provide added convenience and flexibility.Upstairs, four spacious ensuite bedrooms offer privacy and comfort, including a generous primary suite. Each bedroom enjoys its own bathroom, creating a practical and well-balanced floor plan that offers both privacy and functionality.Beyond the main residence, the property offers valuable bonus spaces that are increasingly difficult to find. A detached structure provides the perfect opportunity for a home office, gym, creative studio, playroom, or recreation space. The converted garage includes an additional bathroom and functions as an ideal guest suite, office, or flexible-use space.Move-in ready and meticulously maintained, the home presents a wonderful opportunity to enjoy immediately while gradually incorporating your own design aesthetic and updates over time. With its substantial square footage, adaptable floor plan, multiple bonus spaces, and premier North of Montana location just moments from Montana Avenue, top-rated schools, parks, and the beach, this is a rare opportunity to create your next chapter in one of Santa Monica's most desirable neighborhoods.