One 11 Apartments

One11 Apartments Sofia was created with the vision of setting a new standard in urban living — an intelligent, sustainable, and functional residential environment that combines modern architecture, technological solutions, and a high level of living comfort. The project represents a contemporary, technologically advanced, and sustainable residential development, realized with uncompromising quality control and meticulous attention to every detail. It is the world’s first building realized with the revolutionary Schüco Symbiotic window system — a hybrid aluminum system with an internal PVC structure, delivering exceptional comfort, energy efficiency, and long-term sustainability by combining the best qualities of PVC and aluminum profiles. One11 Apartments Sofia is the winner of the “Building of the Year 2025” award in the category Residential Buildings from 10,000 to 20,000 sq.m., part of Bulgaria’s prestigious national “Building of the Year” competition.

Designed by Elite Project Group with Milkana Ltd., the building expresses a clear architectural vision - Alukönigstahl systems were specified to realise that intent while meeting demanding performance targets.

Located in Sofia, Bulgaria, Bulgaria, this residential apartment buildings project demonstrates how the right combination of window, façade and shading systems delivers measurable performance in a real architectural context.