First occupancy 2026 – Exclusive 4.5-room penthouse with panoramic lake views in Altendorf SZ<br><br>At a privileged location on the Upper Lake, this extraordinary 4.5-room penthouse awaits you. With approximately 150 m² of net living space and an impressive usable area of around 307 m², this attic apartment combines modern design, high-quality materials and a spectacular view of Lake Zurich and the surrounding alpine landscape. Generous window fronts, light-filled rooms and timeless interior design create an exclusive living environment that meets the highest standards.<br><br>Highlights<br><br>• First occupancy from August 16, 2026<br><br>• Exclusive penthouse / attic apartment<br><br>• Approximately 150 m² net living space / approximately 307 m² usable area<br><br>• Breathtaking panoramic lake views extending into the Alps<br><br>• Spacious living and dining area with fireplace<br><br>• Modern designer kitchen with island and breakfast bar<br><br>• High-quality kitchen appliances and refined interior finishes<br><br>• Two stylish bathrooms<br><br>• Whirlpool as an exclusive wellness highlight<br><br>• Pergola with fully closable sides<br><br>• Large-format floor tiles and discreet recessed spotlights<br><br>• Energy-efficient ground source heat pump<br><br>• Comfortable underfloor heating and cooling system<br><br>• Underground parking spaces available<br><br>• Sunny location with excellent connectivity<br><br>• Altendorf railway station reachable within a few minutes' walk<br><br>• A3 motorway junction Pfäffikon SZ in immediate proximity<br><br>This exclusive attic apartment combines modern living comfort, an incomparable view and supreme building quality into a unique home on Lake Zurich.<br><br>**Swiss Twins Immobilien | Real Estate Management** accompanies you personally and competently – from the first viewing to the key handover. Arrange your personal viewing appointment today and discover this extraordinary residential property.