A rare custom estate overlooking Onion Creek and the Onion Creek Golf Course beyond, this exceptional property offers beautiful creek views and direct access for kayaking or tubing. Elevated on a high terrace lot of nearly 1/3 acre and surrounded by towering, century-old oak trees, the home sits above the creek and enjoys remarkable privacy, sweeping tree-canopy vistas, and a peaceful setting that feels worlds away while remaining in the heart of South Austin. From inside the home and across expansive verandas, you overlook the pool and backyard, creating a private, resort-like atmosphere where water, trees, and open sky frame everyday living. Designed for effortless indoor-outdoor flow, most rooms capture backyard and canopy views, ideal for peaceful mornings and memorable gatherings. The spacious open floor plan features travertine floors, refined architectural details, a kitchen with an oversized island, spacious pantry, and light-filled living spaces. All bedrooms are en suite, highlighted by a remarkable primary suite that lives like a private apartment with its own living area, fireplace, kitchenette, office space, dual baths and closets, soaking tub, new frameless shower, and porch access. A separate 1/1 guest apartment near the pool, included in the advertised square footage, provides ideal accommodations for extended family, guests, or a private studio. Located on coveted La Costa Drive within an established neighborhood known for mature trees and pride of ownership, the property enjoys seamless access to Downtown Austin, I-35 corridor, and ABIA offering a rare balance of executive convenience and tranquil retreat for those who value effortless travel, vibrant city life, and a one-of-a-kind private setting.