Welcome to 2519 Cornerstone Ln, a beautifully upgraded and completely turnkey single-family home tucked inside an exclusive gated community of fewer than 40 residences. Offering an exceptional combination of privacy, space, and style, this home backs to a quiet interior tract and features a rare oversized backyard designed for effortless entertaining and everyday enjoyment. As you enter the home, you step inside to a bright, open floor plan filled with natural light. The spacious chef's kitchen seamlessly connects to the family room and living room, creating an inviting central gathering space that is equally suited for relaxed evenings at home or entertaining family and friends. Upstairs, all four generously sized bedrooms feature abundant windows and plenty of natural light, providing comfortable and private retreats for everyone. The backyard is where this home truly shines. Designed with entertaining in mind, it features a built-in private spa/hot tub, built-in BBQ, fire pit, extensive hardscape, and plenty of room for outdoor dining, lounging, and gatherings. A charming front porch adds character and creates a welcoming first impression. Ideally situated near shopping, dining, major freeways, and some of the area's most sought-after amenities, the home is zoned for Adams Elementary, Tewinkle Middle School, and Estancia High School/Early College High School. Orange Coast College and Vanguard University are also nearby, along with Costa Mesa Country Club and Mesa Verde Country Club. Turnkey, thoughtfully upgraded, and ideally positioned within a small gated community, 2519 Cornerstone Ln offers a special opportunity to enjoy privacy and an exceptional indoor-outdoor lifestyle in the heart of Costa Mesa.