Positioned on the desirable west end of Sebastian Street, 139 Sebastian Street offers an exceptional opportunity to build a custom home in one of The Blue Mountains' most coveted bayside communities. Measuring approximately 50 x 191 feet, this rectangular lot offers outstanding depth and a private treed backdrop, creating the ideal canvas for thoughtful design and seamless indoor-outdoor living. Just moments from Georgian Bay, Georgian Peaks Ski Club, the Georgian Trail, golf, skiing, hiking, and marinas, this sought-after location blends natural beauty, privacy, and four-season recreation in a setting surrounded by luxury homes and lifestyle-driven amenities.