Set within the prestigious, guard-gated enclave of Monarch Bay, this stunning single-level estate offers nearly 5,000 sq. ft. of refined coastal living on one of the community's largest lots. Located on a tranquil cul-de-sac, the home welcomes you through an expansive gated courtyard into a sprawling retreat designed for both relaxation & entertaining. The lush grounds feature a covered patio w/skylights, an inviting outdoor fireplace & views of Three Arch Bay's hills & evening lights. Beyond the grand custom entry door, the magnificent great room boasts soaring ceilings, stacked-stone columns, & a floor-to-ceiling marble fireplace, with glimpses of the ocean. The spacious kitchen features stone countertops, an island, stainless steel appliances, an oversized walk-in pantry, & a gracious nook. The expansive primary suite is a private sanctuary, complete with a cozy fireplace, a large walk-in closet, & a French door leading to the serene rear yard. Its luxurious spa-like bath showcases an oversized frameless glass shower, a clawfoot soaking tub & heated towel rack. A secondary primary suite offers elevated ceilings, a walk-in closet, a remodeled marble-accented bath, & a French door opening to the ocean-facing backyard. Designed for versatility, the home also includes two additional bedrooms plus an oversized bonus room featuring an exotic wood ceiling, a stone fireplace, and French doors leading to the courtyard. The rear yard is a peaceful oasis w/mature trees-including Japanese pine, grand magnolia, and oak-complemented by custom stone benches, onyx lighting, a relaxing sauna & views. Additional highlights include exquisite 24” Celini Argento tile, luxuriously remodeled bathrooms, custom lighting, solid wood doors, spacious laundry room with/custom marble pet-washing shower & a massive three-car garage. A separate casita serves as a private office or gym, offering picturesque views of the front grounds & hillside beyond. Residents of Monarch Bay enjoy exclusive access to resort-style amenities including tennis & pickleball courts, a community & dog park, a playground, and the spectacular private beach club-complete with an indoor-outdoor bar, beachfront dining, firepits, & towel, chair, & umbrella service. Ideally located near hiking trails, world-class golf & surfing, & premier coastal resorts like The Ritz-Carlton, Waldorf Astoria & The Montage, this exceptional property is also set to benefit from the exciting Dana Point Harbor revitalization project.