10503 La Costa Dr 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. Expansive upper and lower verandas and multiple screened-in porches overlook the pool, backyard, and rolling greens beyond, creating a private, resort-like atmosphere where water, trees, and open sky frame everyday living. Most rooms are oriented to capture the views, allowing for effortless indoor-outdoor flow ideal for peaceful mornings and memorable gatherings. The custom interior features an open floor plan designed for everyday living & easy entertaining. Travertine floors, refined architectural details, an oversized kitchen island and spacious pantry, and light-filled living spaces define the home's elevated yet welcoming essence. All bedrooms are en suite, providing privacy and flexibility. The primary suite lives like a private apartment with its own living area, fireplace, kitchenette, office, dual baths and closets, soaking tub, new frameless shower, and porch access. A separate 1/1 apartment near the pool, included in the advertised square footage, offers ideal accommodations for extended family, guests, or a private studio. Thoughtfully designed to balance connection and retreat, the home creates space to gather while also offering room to recharge. 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, & ABIA, offering a balance of executive convenience and tranquil retreat for those who value effortless travel, vibrant city life, and a one-of-a-kind private setting.