The lower storeys are designed as commercial units, while the remaining approximately 630 units offer residential space for up to 1,400 people – from one-room flats to spacious four-room apartments. All apartments feature modern and high-quality fittings, including aluminium window systems from heroal, as well as luxurious bathrooms, wooden floors and "smart living" options. The environmental footprint of the material aluminium is also a central sustainability factor. The energy-efficiency of the installed elements with reduced material use is also taken into consideration: heroal uses up to 85% recycled aluminium in the production of the complete system portfolio, ranging from windows, doors and curtain walls to roller shutters, sun protection and roller doors. That way, 95% less energy is used compared to using newly produced aluminium, without any loss of quality. Aluminium systems are quite durable. This is due to their high weather resistance, natural protection against corrosion as well as high material stability. Even when opened and closed a multitude of times, there is minimal wear and tear.