Much of Iqaluit's architecture is functional – designed to minimize material costs, while retaining heat and withstanding the climate. Early architecture runs from the 1950s military barracks of the original DEW line installation, through the 1970s white hyper-modernist fibreglass block of the Nakasuk School and Municipal Offices and Arena, to the lines of the steel-reinforced concrete high-rise complex on the hill above it. A number of older Hudson's Bay Company and early 1950s buildings have been retained and restored in Apex (the former nursing station has been revived as the Rannva Bed and Breakfast, the HBC buildings as an art gallery). The newer buildings are more colourful and diverse, and closer to the norms of southern architecture.